Cellular differentiation progressively restricts cell fate because the unexpressed genes in the cell undergo increasing repression.
What do you mean by repression?
Repression is a psychological defense mechanism whereby a person unconsciously blocks unacceptable thoughts, feelings, and memories from their awareness. It can involve the denial or suppression of desires and impulses, or even the distortion or transformation of such desires into more acceptable forms. Repression is a defense mechanism that is used to keep potentially threatening or uncomfortable information out of conscious awareness.
Cellular differentiation is the process by which a single cell divides, resulting in two or more specialized cells that have different functions. As this process occurs, the cell's gene expression profile changes, with some genes becoming more active and others becoming increasingly repressed. This is done in order to ensure that the cell will be able to specialize in performing certain tasks and that it will not become confused and perform the wrong function. As the cell's gene expression profile changes, the number of genes that are expressed reduces, restricting the range of functions the cell can perform. This increasing repression of genes restricts the cell's fate and ensures it will specialize in performing a specific task.
Hence, the correct option is E.
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The grandfather in this family was a "high risk individual. How many of his children were either medium or high risk individuals? How many of grandchildren were either medium or high risk individuals?
Assuming, that high risk genes are = aa, medium risk genes are = Aa, low risk genes are = AA, so there should be all normal generation.
What is genetics?The study of genes and heredity is known as genetics. Genetic characteristics and qualities (such eye color and a higher likelihood of contracting a certain disease) are passed from parents to children through heredity.
Considering that grandma carries genes with a moderate risk He has two children with medium risk genes and two children with high risk genes.
All of his children (grandkids to the grandpa) would have medium risk genes if one of his sons with a high risk gene marries a girl with a normal or low risk gene.
Due to the recessive nature of the high risk gene, the number would drop.
Thus, as we age, it will become less displayed until a different type of recessive person arises. There is a possibility that one of their offspring will carry a high risk gene.
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Your question seems incomplete, the missing image is:
What is true regarding both theories and laws?
Both laws and theories are supported by scientific experiments and observations.
Laws are not same as theories but they do exists side by side with each other. A law is simply a type of scientific theory which is used to predict behavior of things around us. A law is a rule which governs how certain things will react, work exists. Example : Laws of motion given by Sir Isac Newton
A theory is more like an explanation to a phenomenon or a law, it explains why and how things happens. A theory supports a law. A theory is also supported by rigid observations and experiments like laws. Example : Theory of Evolution.
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Progression of recovery from a surgical procedure through phase II includes which of the following?(Select all that apply.)
A. Vital signs returning to preoperative state B. Recovery of reflexes and motor control
C. Patient awake and oriented
D. Patient meeting discharge criteria
E. Absence of pain
Vital signs returning to preoperative state, Recovery of reflexes and motor control are the most vital phase after the recovery of patient.
how many phases of recovery stages ?
Recovery from an alcohol use problem needs time, work, willpower, and support. When you choose to attend a professional alcohol and drug treatment programme, you will embark on a journey through four unique phases of rehab recovery while learning to live a healthy and sober lifestyle.
The four stages of therapy are as follows:
The start of treatment
Abstinence at a young age
Maintaining abstinence
Advanced recuperation
The National Institute on Drug Abuse established these phases as a resource for individual drug therapy for healthcare practitioners, but it is also a valuable model for alcohol addiction recovery. Recovery, according to this approach, is a lifetime process.
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Which of the following is a normal constituent of urine? Glucose Blood Large proteins Creatinine
Answer:Urea is the most abundant organic compound in urine.The kidney helps to regulate acid-base balance in the body; therefore, hydrogen ions are a normal component of urine.Creatinine is produced at a constant rate by the muscles; the measure of the amount of creatinine in the urine is a good indicator of glomerular filtration rate because it is filtered and not reabsorbed or secreted.Amino acids are normally present in the glomerular filtrate, and 95% are reabsorbed in the tubules. Thus, a small amount of amino acids would be expected in the urine. High levels of amino acids in the urine might indicate a disorder of amino acid metabolism.
There are times when abnormalities involve whole _________ that do not separate properly, whereas other abnormalities are produced by harmful genes.
Answer:
Chromosomes; Genes
Explanation:
Hope it helps:)
Red color is inherited in a dominant manner and white stem areinherited in a recessive manner. All (100%) of the plants of the F1generation from two parent plants show the red color leaves andwhite colored stem . One of the plants was homozygous recessive forboth traits. Write the genotype of each of the parent plants andthe F1 generation. What would the parents plants look like?
All F1 generation plants will be spherical seeded and have the genotype Ss (heterozygous).
F1 refers to the first filial generation of seeds/plants or animal offspring produced by a cross-mating of distinctly different parental types. In general, the characteristics of plants, insects, animals, and humans are the result of numerous gene interactions.
The first filial generation is referred to as the F1 generation. Filial generations are the names given to successive generations of offspring from controlled or observed reproduction. For parental generation, the letter "P" is assigned to the first generation. The first generation of offspring from these parents is referred to as the F1 generation. The F1 generation can procreate to produce the F2 generation, and so on. Scientists use this term to track groups of offspring as they study the genetics of different generations.
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Why is the relative thermodynamic stability of isomeric organic compounds inferred from the heats of combustion?
since you need a standard to assess stability against. The amount of CO2 and H2O produced by the combustion processes of organic isomers will be the same, hence the only differences between the starting material and the product will be 1) the structure & 2) the heat produced by the process.
The instability of the isomeric alkali metals affects how much heat is released during combustion; more stable alkane isomers release less heat, whereas less stable alkane isomers release more heat due to weaker C-H bonds and a lack of branching. The heat generated when the compounds are burned can be used to gauge the relative temperature dependence of isomers; less heat equals higher stability. We must keep in mind that the heat of combustion is exactly proportional to the quantity of carbon atoms. The heat of burning increases with the quantity of organic carbon atoms. There are six carbon atoms in structure I There are five carbon atoms in structure.
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48. Which of the ff complication mostly occur due to tracheotomy tube ? A. Increase blood pressure C. increase cardiac output B. Damage laryngeal nerve D. Acute respiratory distress
Answer:
D. Acute respiratory distress
Here is a hypothetical evolutionary tree showing domestic and wild pigeon populations. If this were the real tree (it's not), how many times would you infer that pigeons have been domesticated within the populations measured here?
Since the population tree has been depicted in the question, it is possible to calculate the proportion of wild and domestic pigeons in a population.
What is a hypothetical population ?A population whose unit is not physically present is know as the hypothetical population. A population is made up of groups of observations, things, etc. that share a characteristic. Something that is hypothetical means it has been hypothesized. It essentially means anything that is anticipated to occur, supported by adequate justification, logical reasoning, and evidence. It implies to anticipate and estimate the worth of a future event. IN this instance, a hypothetical population is a projection of the population, or what is anticipated to be the population. For instance, it is projected that there will be approximately 9 billion people on the planet in 2050. Research has shown that the number of wild pigeons is 31, 12, and 10, while the number of domestic pigeons is 24 + 15 = 39. Since the data is fictitious, t may change. It is a lack of accurate documentation of the number of pigeons in that population.
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select all of the following that occur in natural populations and that violate the assumptions of the hardy-weinberg equilibrium.
The assumptions violate hardy Weinberg equilibrium are: migration among populations οccurs , mating is often non-random , allele frequencies can change due to chance events. Thus, Option B, C, D are correct.
Weinberg equilibrium :Hardy Weinberg equilibrium principle states that allele frequencies in a population are stable and is cοnstant from generation tο generation in the absence of disturbing factors. The factors affecting the equilibrium are gene migration or gene flοw , genetic drift , mutation, genetic recombination and natural selection. According tο this principle the gene pοol remains constant. This is called genetic equilibrium. Sum total of all allele frequencies is 1. Hardy Weinberg fοrmulated an algebraic equation [tex]\mathrm{( p+q)_2 = 1 }[/tex]
Or [tex]\mathrm{P_2 +2pq+q=1}[/tex]
Where p represents the frequency οf dominant allele A and q represents frequency of recessive allele a.
AA that is frequency of dοminant homozygous is represented by p₂.
2pq represents the frequency of heterοzygous Aa.
q₂ represents the frequency of homοzygous recessive aa.
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Complete question:
Select all Of the following that could cause a population to deviate from Hardy-Weinberg equilibrium.1 Natural selection favoring heterozygotes2 Emigration from the population3 reduction to a small population Size4 Immigration of homozygote
Options 1, 3, and 4 cause a population to deviate from Hardy-Weinberg equilibrium.
What do you mean by population?
Population is a term used to describe a group of individuals or organisms of the same species living together in a particular area or region. It is used to describe the total number of people, animals, or other organisms in a given area at a given time.
Natural selection favoring heterozygotes, reduction to a small population size, and immigration of homozygotes can all cause a population to deviate from Hardy-Weinberg equilibrium. These three factors can cause genetic drift, which is a random change in the frequency of alleles from one generation to the next. Emigration from a population does not affect the Hardy-Weinberg equilibrium as this process does not alter the allele frequencies.
Hence, option 1, 3 and 4 are correct.
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name and describe the structure and function of two cns glial cells, and the structure and function of two pns glial cells, making clear which system each pair of glial cells described belong to.
Answer: CNS Glial Cells:
a. Astrocytes: Astrocytes are a type of glial cell in the brain and spinal cord that support neurons and help repair the blood-brain barrier.
b. Oligodendrocytes: Oligodendrocytes are another type of glial cell in the brain and spinal cord that produce myelin, the protective coating that surrounds and insulate axons, helping to increase the speed of neural signaling.
PNS Glial Cells:
a. Schwann Cells: Schwann cells are a type of glial cell in the peripheral nervous system that produce myelin, the protective coating around axons, and help in the repair and regeneration of axons.
b. Satellite Cells: Satellite cells are another type of glial cell in the peripheral nervous system that support neurons and help to control the activity of the neurons in the ganglia.
Explanation:
the colonies illustrated on the blood and chocolate agar plates represent a slow-growing bacterial species that is endogenous in the oral cavity and upper respiratory tract. it may be recovered from human bite skin infections incurred during fistfights. note the pitting of the agar surrounding the colonies growing in the chocolate agar plate. the alk/alk non-fermentative reaction seen in the kligler iron agar tube to the left in the lower photograph indicates the non-fermentation of glucose, also indicated by the lack of carbohydrate assimilation in the individual carbohydrate reaction tubes to the right of the kia tube. a reduction of nitrate is seen and decarboxylation of ornithine is also positive. based on these observations, select from the multiple choices listed the correct identification of this bacterial isolate:
Based on the given information, it is likely that the bacterial isolate is a strain of Porphyromonas gingivalis.
Porphyromonas gingivalis is a slow-growing, gram-negative anaerobic rod-shaped bacterium that is commonly found in the oral cavity and upper respiratory tract. It is known to be associated with periodontal diseases and is also found in human bite skin infections incurred during fistfights.The pitting of the agar surrounding the colonies growing in the chocolate agar plate is consistent with the colony morphology of P. gingivalis.The alk/alk non-fermentative reaction seen in the Kligler Iron Agar tube and the lack of carbohydrate assimilation in the individual carbohydrate reaction tubes indicate that the bacteria is non-fermentative, which is also consistent with P. gingivalis.The reduction of nitrate and positive decarboxylation of ornithine also support the identification of P. gingivalis.It is important to note that the above identification is based on the given information and other tests such as PCR and sequencing are needed to confirm the bacterial isolate.
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"transcriptome analysis-identified long noncoding RNA crande in maintaining endothelial cell proliferation, migration, and tube formation"who wrote this article?
Transcriptome analysis-identified long noncoding RNA crande in maintaining endothelial cell proliferation, migration, and tube formtion it is written by Matthew Moran
What is the result of above research ?RNA-seq was carried out to ascertain palmitic acid's impact on the endothelium transcriptome. Following treatment with 100 M palmitic acid, RNA sequencing was carried out on human umbilical vein endothelial cells (HUVECs). Following alignment and differential expression analysis in accordance with process, the clusters were principal component analysed, and the palmitic acid treatment and control (fatty acid-free BSA) clustered as predicted.
There are 27.4% lncRNA and 35.5% mRNA transcripts in the analysis (Fig. 1B). For the samples, between 60 and 80 million reads were mapped (Supplementary Table 1). When an mRNA's average counts per million (CPM) in one circumstance (control or PA) exceeded 1, it was deemed to be expressed.
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pause the video at 6:39!!! do it!! ok, thank you :) in the skill practice question at 6:39 in the video, what is the total number of offspring that are the result of crossover events? (look for the offspring whose phenotypes are different from the parental phenotypes)
Wild type small wings and garnet eyes are produced as the result of crossing two separate phenotypic groups.
Phenotype refers to a person's distinctive characteristics, such as height, eye color, and blood type. The environment and a person's genotype, or genetic make-up, both have an impact on their phenotype. Definitions of "phenotype" and "genotype" SUMMARY QUICKLY. A person's genotype is the sum of alleles they have for a particular gene. The culmination of a person's attributes or distinctive qualities is their phenotype. The genotype of an organism, which is only influenced by its parents, establishes its phenotype. Small wings and garnet eyes are characteristics of the wild type that can be generated by mating two different phenotypic groups.
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what is the rest you
If a cell is selectively reducing the concentration of a particular enzyme in the extracellular fluid it will likely utilize ________.
Group of answer choices
a. phagocytosis
b. receptor-mediated endocytosis
c. exocytosis
d. pinocytosis
If a cell is selectively reducing the concentration of a particular enzyme in the extracellular fluid it will likely utilize receptor-mediated endocytosis. Thus, the option is B.
Receptor- mediated endocytosis is a complex phenomenon in which binding of large extracellular molecules, such as viruses, to receptors on the cell membrane triggers assembly of clathrin triskelion.
The most important form of receptors- mediated endocytosis is the Clathrin- mediated endocytosis. Clathrin is a polypeptide molecule located in particular regions of the cell membrane.
These vesicles act as tools to move molecules inside the cell. If the receptor- bound molecule is a pathogen, opsonization mechanism is activated, meaning the molecule is tagged as a pathogen for subsequent destruction.
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The sea slug Pteraeolidia ianthina (P. ianthina) can harbor living dinoflagellates (photosynthetic protists) in its skin. These endosymbiotic dinoflagellates reproduce quickly enough to maintain their populations. Low populations of the dinoflagellates do not affect the sea slugs very much, but high populations (> 5 x 105 cells/mg of sea slug protein) can promote sea slug survival. If we assume that carbon is the sole nutrient needed by sea slugs to drive their cellular respiration, then based on the graph, during which season(s) is it least necessary for P. ianthina to act as a chemoheterotroph?A) winter B) spring C) summer D) fall
Chemoheterotroph is an organism which cannot synthesize organic food source instead they dinoflagellates depend on organic chemicals synthesized by other organisms.
The statement that during winter it is least necessary for P. ianthina (the sea slug) to act as a chemoheterotroph . The information provided does not indicate any relationship between the sea slug's dependence on chemoheterotroph and the season. The sea slug supplies host and inorganic materials to the Dinoflagellates chemoheterotroph is a correct statement, as the dinoflagellates living inside the sea slug's skin benefit from the host's protection and nutrients while the sea slug benefits from the dinoflagellates photosynthesis which provides additional source of food.
chemoheterotroph is not included in the question. So, It was included below.
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Sliding laterally off the lateral border of the scapula, you can feel the tube-shaped belly of which muscle?
a. teres minor
b. teres major
c. latissimus dorsi
d. The teres major muscle
You can feel the tube-shaped belly of teres major muscle.
What is teres major?
The teres major is a muscle located in the upper back and shoulder area. It is responsible for rotating and retracting the shoulder blade and is an important muscle for stabilizing the shoulder joint. Its origin is on the scapula and its insertion is on the humerus. It works in conjunction with the latissimus dorsi, pectoralis major and subscapularis muscles. It is important for activities such as throwing, pushing and pulling. Weakness in the teres major muscle can lead to shoulder pain, instability and decreased performance. Strengthening this muscle is important for shoulder health and improved shoulder function.
Therefore, You can feel the tube-shaped belly of teres major muscle.
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An allelic series determines coat color in rabbits: C (full color), cch (chinchilla, gray color), ch (Himalayan, white with black extremities), and c (albino, all white). The C allele is dominant over all others, cch is dominant over ch and c, ch is dominant over c, and c is recessive to all other alleles. This dominance hierarchy can be summarized as C > cch > ch > c. The rabbits in the table are crossed and produce the progeny shown.Cross Parents OffspringA full color × albino 50% full color, 50% albinoB Himalayan × albino 50% Himalayan, 50% albinoC full color × albino 50% full color, 50% chinchillaD full color × Himalayan 50% full color, 25% Himalayan, 25% albinoE full color × full color 75% full color, 25% albinoMatch the parental genotypes to the letter corresponding to the appropriate cross listed in the table above.Word bank: a b c d ec^hc x cc, Cc x chc, c^hc^h x cc, Cc x cc, Cc^ch x cc, Cc x Cc
a. Parents: full color and albino
Right option is Cc X cc
b. Parents: Himalayan and Albino
Offspring: 50% Himalayan and 50% albino
Right option is chc X cc
c. Parents: Full color and Albino
Offspring: 50% full color and 50% chinchilla
Right option is Ccch X cc
d. Parents: Full color and Himalayan
Offspring: 50% full color, 25% Himalayan and 25% albino
Right option is Cc X chc
e. Parents: Full color and full color
Right option is Cc X Cc
What is allele?
An allele is one of two or more variations of the DNA sequence in a particular genomic region (a single base or a segment of nucleotides). An individual inherits two alleles—one from each parent—for each genomic region having this variation. If the two alleles are identical, the individual is homozygous for that allele.
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In 1958, Meselson and Stahl conducted an experiment to determine which of the three proposed methods of DNA replication was correct. Identify the three proposed models for DNA replication. the Meselson and Stahl experiment starts with E. coli containing 15_N/15_N labeled DNA grown in 14_N media. Which result did Meselson and Stahl observe by sedimentation equilibrium centrifugation to provide strong evidence for the semiconservative model of DNA replication? O the first generation has hybrid 15_N/15_N DNA, and the second generation has both hybrid 15_N/14_N DNA and 14_N/14_N DNA. No 15_N/15_N DNA was observed. O the first generation has hybrid 15_N/14_N DNA, and the second generation has hybrid 15_N/14_N DNA. No 15_N/15_N DNA or 14_N/14_N DNA was observed. O Both the first and second generation have both 15_N/15_N DNA and 14_N/14_N DNA. No hybrid 15_N/14_N DNA was observed.
Semi-conservative, conservative, and dispersive replication models were proposed as possible mechanisms for organisms to repeat their DNA.
What three things are necessary for DNA replication?Mammals and the species use bidirectional replication. To start and continue DNA synthesis, four fundamental elements are needed. Substrates, templates, primers, and enzymes are what they are.
What are the three applications of DNA technology?The fields of DNA and molecular biology have made tremendous strides. It has applications in pharmacology, genetic engineering for disease prevention, boosting agricultural development, and forensics for the detection of sickness and criminal activity, among other things.
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which of the following may result from the overuse of fertilizers? group of answer choices an increase in photosynthesis an increase in carbon emissions a decrease in plant growth eutrophication of waterways erosion of soil
Overuse of fertilizer will result in the eutrophication of waterways. So statement 4 is the correct one.
The process of eutrophication is when algae in a body of water grow too much. When an entire body of water—or just a portion of it—is loaded with minerals and nutrients, especially nitrogen and phosphorus, this happens.
The three fundamental plant nutrients—nitrogen, phosphorus, and potassium are included in the majority of fertilizers used in agriculture. A few "micronutrients" that are essential for plant growth, such are zinc and other metals, which are also included in some fertilizers.
Therefore, when more fertilizer is used, the runoff of the agricultural land will cause the water body to be enriched with nutrients. This favors the algae to grow and causes algal bloom. Therefore, statement 4 is correct.
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What is the main reason for displaying data in a graph?
OA. It helps scientists identify errors in an experiment's design.
OB. It shows more data than a table does.
C. It proves the scientific validity of the hypothesis.
OD. It allows scientists to interpret data visually.
OD. It allows scientists to interpret data visually.
The main reason for displaying data in a graph is to make the data more interpretable, accessible and easy to understand. Graphs allow scientists to visually represent the data and identify patterns, trends, and relationships that may be difficult to discern from the raw data or from a table. By displaying data in a graph, scientists can quickly and easily identify outliers, compare different data sets, and make predictions. Additionally, graphs are a powerful tool for communicating research findings to others, as they can be easily understood and interpreted by a wide audience, including scientists, policymakers, and the general public.
OA. It helps scientists identify errors in an experiment's design.
OB. It shows more data than a table does.
C. It proves the scientific validity of the hypothesis.
All these options can be useful too, but they are not the main reason for displaying data in a graph.
In eukaryotic cells, the processes of protein synthesis occur in different cellular locations.Drag the labels to the appropriate targets to identify where in the cell each process associated with protein synthesis takes place.formation of ribosomal subunitsattachment of an amino acid to tRNAtranslation of cytoplasmic proteinstranscription and RNA processingtranslation of secreted proteins
In eukaryotic cells, the process of protein synthesis involves several stages that occur in different cellular locations.
Transcription: The first step in protein synthesis is the transcription of DNA into RNA. This process occurs in the nucleus, where a specific region of DNA is copied into a complementary RNA molecule.
RNA Processing: The RNA molecule undergoes several processing steps to remove non-coding regions and prepare it for translation. This includes the removal of introns and the addition of a poly-A tail.
Translation: The RNA molecule is then transported out of the nucleus and into the cytoplasm, where it is translated into a protein. Translation occurs on ribosomes, which are composed of two subunits. These subunits are synthesised in the nucleolus.
Attachment of an Amino Acid to tRNA: The process of adding an amino acid to a tRNA molecule occurs in the cytoplasm, before the translation process. It is catalysed by an enzyme called aminoacyl-tRNA synthetase.
Translation of cytoplasmic proteins occurs in the cytoplasm, the site of translation where the ribosomes read the sequence of nucleotides on the mRNA and match it to the sequence of amino acids in a protein.
Translation of secreted proteins: It also occurs in the cytoplasm, and after the translation process, the proteins are transported out of the cell via exocytosis or secretion through the plasma membrane.
Each process is essential for the correct formation of proteins, and their correct location guarantees their function.
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Describe the energy transfer among the organisms in the pyramid. Use percentage data to support your answer.
Following primary consumers are omnivores and carnivores in the pyramid's succeeding levels. Only 10% of the energy is transferred to the next level at each rung of the food chain, with the remaining 90% being lost as heat.
How will you describe the energy pyramid's transfer?As you move up the pyramid, past the trophic levels to the primary, secondary, and tertiary consumers, the amount of energy decreases and the levels get smaller.
Why does an energy pyramid only transfer 10% of energy across trophic levels?Only around 10% of the energy is transferred to the following trophic level as a result. The remainder of the energy leaves.
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A processed eukaryotic mRNA...(d) Referring to the figures provided, explain why the polypeptide produced when the transformed bacteria translate the introduced eukaryotic mRNA provides evidence for the common ancestry of all living organisms.
The polypeptide produced by translation of a processed eukaryotic mRNA by a eukaryotic cell or prokaryotic cell into which it has been introduced should have the same amino acid sequence because the genetic code is almost universal and the same codon chart can be used for both prokaryotic and eukaryotic organisms.
What is eukaryotic mRNA ?An area of DNA from a linear chromosome gets translated into a pre-mRNA in the nucleus. While remaining in the nucleus, this transcript must go through processing (splicing and inclusion of the 5' cap and poly-A tail).
In eukaryotes, one protein is represented by each bit of mRNA (or more than one protein in prokaryotes). Ribosomes employ the instructions provided by mRNA as a template during translation to attract and assemble the amino acids to produce the desired peptides/proteins.
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predict what would happen if a sample was immersed in the chromatography solvent, instead of suspended above it
It will not be possible to know the distance traveled by the sample if it is suspended in the solvent. It will not show migration and separation of the compounds. Therefore, the experiment will not give information on the Rf value of the sample.
What is chromatography ?Chromatography is a technique for separating mixture's constituent parts. The combination is first dissolved in a substance known as the mobile phase, which then transports it through a subsequent substance known as the stationary phase.
Chromatography is a method of analysis used to separate chemical mixtures into their component compounds. In a lab, various chromatographic methods are employed. such as gas chromatography, thin-layer chromatography, and column chromatography, among others. Picture of column chromatography
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which of these observations from other scientists helped charled darwin and alfred wallace shape their ideas of evolution? (check all that apply)
Darwin and Wallace both understood that an animal may produce more offspring than others if it possesses a feature that makes it more resilient to the weather or able to breed more successfully.
The trait will typically increase in prevalence in the generation after that and the one after that. The mechanism of natural selection for evolutionary change was independently discovered by Charles Darwin and Alfred Russel Wallace. Wallace observed that a tortoise's or a mockingbird's characteristics varied depending on where they lived. Depending on where they resided, the mockingbirds either had a pristine white breast, dark patches behind their eyes, or varied patterns on their shells on the tortoises. Darwin cited a variety of sources to back up his hypothesis of evolution by natural selection, including anatomical, biogeographical, and fossil data.
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Do a search online or look in your textbook for 1-2 antibiotics that affect Gram-positive bacteria and list them. On what part of the cell do the antibiotics usually work? List one or two antibiotics that affect Gram-negative bacteria? On what part of the cell do the antibiotics usually work? (Be sure to cite your sources in your answer.)
Vancomycin, teicoplanin, cephalosporins, and aztreonam are two antibiotics that impact Gram-positive bacteria. These antibiotics inhibit bacterial cell wall formation.
In order to know that Gram-positive bacteria are bacteria that test positive in the Gram stain test, which is generally used to swiftly classify bacteria into two major categories based on their cell wall type. Gram-positive bacteria absorb the crystal violet dye used in the test and appear purple when viewed via an optical microscope. First we consider, vancomycin and Teicoplanin. Vancomycin and Teicoplanin are two antibiotics that affect Gram-positive bacteria. These medicines inhibit bacterial cell wall formation. And vancomycin binds strongly to the D alanyl D alanine residues of the phosphodisaccharide-pentapeptide during second layer cell wall production, preventing further cell wall synthesis.
(Watanakunakorn, C. (1984). Vancomycin's mode of action and in vitro activity. Journal of Antimicrobial Chemotherapy, 14(suppl D), 7–18. doi:10.1093/jac/14.suppl_d.7 )
On the other hand, Cephalosporins and aztreonam are two antibiotics that attack Gram negative bacteria. Gram negative bacteria, in general, have an outer membrane. Most antibiotics are prevented from entering. As a result, they must be modified in order to enter through the pore channels of the outer membrane. Antibiotics work in the same way, by degrading the peptidoglycan layer. Antibiotics such as fluoroquinolones (such as, ciprofloxacin) bind to the DNA gyrase enzyme and impede cell division.
(Kapoor, Garima, Saurabh Saigal, and Ashok Elongavan. "Action and resistance mechanisms of antibiotics: A guide for clinicians." Journal of anaesthesiology, clinical pharmacology 33.3 (2017): 300)
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which of the following statements is a valid explanation of the change shown in the graph? (5 points)
The graph's change can be well explained by the fact that rising temperatures hasten bacterial multiplication.
The graphic shows that the number of generations each hour increases as the temperature rises. The reproduction rate for the microorganism, which in this case is the bacterium, is the generation per hour. The rate of bacterial growth increases along with the temperature. In general, bacteria can grow more readily up to a certain point the higher the temperature. Both extremely high and very low temperatures block the enzyme reactions that are necessary for bacteria to live. Membranes, RNA, DNA, ribosomes, protein, and enzymes are all significantly impacted by high temperatures, which also have a significant impact on the structural and physiological characteristics of sporulating and non-sporulating bacteria.
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complete question: Which statement is a valid conclusion based on the information in the graph?
Select one:
a. Changes in temperature cause bacteria to adapt to form new species.
b. Individual species reproduce within a specific range of temperatures.
c. Increasing temperatures speed up bacterial reproduction.
d. Bacteria can survive only at temperatures between 0°C and 100°C.
