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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What geographic region is not on the map but is located between the sahel and the congo basin and can be described as having fertile grasslands, farmland, and plenty of wildlife that you would find on safari tours?
Savanna
Great rift valley
Sahara
Coastal areas
write the number of offspring plants with each phenotype in the offspring phenotype columns. also, make sure you have run enough trials that you can both determine the genotype of each parent plant and produce yellow and white-flowered plants.
As a result, with this cross, you would anticipate that three of the four (75%) progeny will have purple flowers and one of the four (25%) would have white flowers.
The genotypes of the offspring of this hybrid can be used to predict the proportions of phenotype. Offspring with either the BB or Bb genotype will have the purple-flower phenotype because B is dominant to b. The white-flower phenotype can only be inherited through the bb genotype.The white-flower phenotype can only be inherited through the bb genotype. Mendel obtained the same percentages in his initial experiment.For instance, the genotype Yy was present in the F1 yellow plants that inherited a Y allele from their yellow parent and a y allele from their green parent.
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What are the 4 types of anatomical planes?
Answer:
The sagittal plane, the coronal plane, the cranial and caudal plane
Explanation:
An anatomical plane is a hypothetical plane that is used to transect the body to indicate the placement of structures or the direction of movement. Three major planes are employed in human and animal anatomy:
The sagittal plane, also known as the lateral plane (longitudinal, anteroposterior), is a plane that runs parallel to the sagittal suture. It separates the body into two parts: left and right.
The coronal plane (vertical) separates the body into dorsal and ventral (back and front or posterior and anterior) halves.
The cranial and caudal (head and tail) sections of the animal are divided by the transverse plane or axial plane (horizontal).
which of the following is the best example of a conditioned reinforcer? * 1 point a cold root beer for mowing the lawn on a hot day pudding for eating all your peas at supper termination of shock after removing one's finger from a live electric wire a spanking for eating cookies before dinner applause for an excellent piano recital
The best example of a conditioned reinforcer is a cold root beer for mowing the lawn on a hot day.
What is conditioned reinforcer?
A conditioned reinforcer is a stimulus that has been associated with a primary reinforcer and is used to increase the probability of a desired behavior. It is used to reinforce a behavior that has been learned through conditioning. Examples of conditioned reinforcers include verbal praise, tokens, and points.
Therefore, The best example of a conditioned reinforcer is a cold root beer for mowing the lawn on a hot day.
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The main difference between the different categories of signaling is the distance that the signal travels through the organism to reach the target cell. True Or False
It is true that the main difference between the different categories of signaling is the distance that the signal travels through the organism to reach the target cell.
What is organism?
Organism is an individual living being, such as an animal, plant, fungus, or microorganism. Organisms are capable of growth, reproduction, and maintaining a stable internal environment to respond to changes in their external environment. They are also capable of responding to stimuli, adapting to their environment, and undergoing metabolism and energy production to sustain themselves.
Therefore, It is true that the main difference between the different categories of signaling is the distance that the signal travels through the organism to reach the target cell.
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Doctors sometimes use a vaccine to prepare the body to defend itself against future infections. These vaccines most often containanswer choicesantibodiesantibioticswhite blood cellsweakened pathogens
Doctors sometimes use a vaccine to prepare the body to defend itself against future infections.
These vaccines most often contain weakened pathogens.
A vaccination is a biological treatment that boosts resistance to a specific disease. It includes a pathogen that doesn't cause disease, like a virus or pathogens that has been weakened or rendered inactive. The immune system responds to the introduction of this virus by creating specific antibodies in response to it because it perceives it as a foreign substance. The immune system is trained to recognise and respond promptly and effectively if the person is exposed to the real virus later on through this process of exposure to a harmless variant of the disease. White blood cells, antibiotics, and antibodies are all parts of the immune system, but they are not usually included in vaccinations because they are not required to develop a protective immunity.
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provide reasoning to explain how mutant 1 can grow on treatment i medium but cannot grow on treatment iii medium.
Mutant 1 can use methionine when it is present in the medium, but it cannot synthesize methionine.
A mutant is an organism or a new genetic character that arises or results from an instance of mutation, which is generally an alteration of the DNA sequence of an organism's genome or chromosome.
It is a characteristic that would not be found in a specimen naturally. A virus with a change in its nucleotide sequence whose genome is in the nuclear genome is also referred to as a mutant.
The natural occurrence of genetic mutations is essential to the evolution process. The study of mutants is an important part of biology; by understanding the effect of a gene mutation, it is possible to determine the normal function of that gene.
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you are caring for a laboring, multiparous client in the second stage of labor without an epidural. of the following, which should be included in your education?
The foetus is delivered during the second (rather than the fourth) stage of labour. The placenta is delivered at the third (rather than fourth) stage of labour.
when will epidural for labor are administered ?
If you choose for an epidural, an anesthesiologist will implant a needle and a thin tube known as a catheter into the bottom area of your back. The needle is removed, but the catheter is left in place for medication delivery through the tube as needed. In consultation with your doctor, you can start an epidural at any point during your labour — at the beginning, the middle, or even near the end.
Not only are the mother and baby healing from the physical process of delivery, but they are also getting to know one other and other family members. The foetus is delivered during the second (rather than the fourth) stage of labour. The placenta is delivered at the third (rather than fourth) stage of labour.
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This tutorial will take you step-by-step through the question. Shell coiling of the snail Lymnaea peregra results from a genetic maternal effect. An autosomal allele for a right-handed shell, st, called dextral, is dominant over the allele for a left-handed shell, s, called sinistral. In general, snails are hermaphroditic and reproduce as both males and females. However, a pet snail named Martha is sinistral and reproduces only as a female. Martha and her family are shown in the pedigree. Martha's dad Martha's mom Sinistral o Dextral Martha Dextral o Sinistral Sinistral Sinistral o Sinistral Sinistral Sinistral Dextral Dextral Dextral Step 2: Based on the mother's genotype, determine the phenotype expressed in the progeny. Determine the phenotype of the progeny given a specific maternal genotype. Place the expected phenotype of the progeny next to each genotype of the mother. Mother's genotype Phenotype of progeny Answer Bank sts sinistral dextral SS
In this snail population the right handed coiling which is called dextral (S+) is dominant trait over sinistral (S) the left handed coiling.
What is a dominant and recessive trait?
A dominant trait is a trait that is expressed when a single allele is present in an organism. A recessive trait is a trait that is only expressed when two alleles for that trait are present in the organism. For example, the trait for eye color in humans is determined by two alleles: brown (dominant) and blue (recessive). If an organism has one brown allele and one blue allele, the organism will have brown eyes since the brown allele is dominant. If both alleles are blue, the organism will have blue eyes.
So it means that in the table:
The genotype S+S+ & S+S will show the dominant phenotype dextral as it holds the dominant phenotype (S+), and the SS will show the recessive trait sinistral as the trait S is described as the recessive trait.
Mother's genotype Phenotype of the progeny
S+S+ Dextral
S+S Dextral
SS Sinistral
Therefore, dextral (S+) is dominant trait over sinistral (S) in this snail population.
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Based on the graph, which wavelengths would be utilized the most in a hypothetical photosynthetic organism that would contain only chlorophyll a and no other pigment? Absorption Spectra Chlorophylla --- Chlorophyll ---Carotene 350 400 500 550 600 650 700 Wavelength (m) 440 nm and 660 nm 420-450 nm only 440-660 nm 0 400-500 only
The wavelengths which would be utilized the most in a hypothetical photosynthetic organism that would contain only chlorophyll a and no other pigment 440nm & 660 nm.
What is chlorophyll?Chlorophyll is essential for photosynthesis, which allows plants to absorb energy from light.
Chlorophyll molecules are organised in and around photosystems that are incorporated in chloroplast thylakoid membranes. Chlorophyll performs three roles in these complexes:
The vast majority of chlorophyll (up to several hundred molecules per photosystem) absorbs light.
After that, these identical centres carry out their secondary function: The transmission of that energy to a specific chlorophyll pair in the photosystems' reaction centre via resonance energy transfer.
This particular pair is responsible for the ultimate function of chlorophylls: Charge separation results in unbound protons (H+) and electrons (e) that drive biosynthesis independently.
The two currently recognised photosystem units are photosystem I and photosystem II.
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Complete question:
Which of the following statements is TRUE for specific gravity measured by the urine chemical reagent strip method?The urine chemical reagent strip method is not affected by the presence of x-ray contrast media in the urine specimen.
The urine chemical reagent strip method is not affected by the presence of x-ray contrast media in the urine specime
What is specific gravity ?Specific gravity, often known as relative density, is the ratio of a substance's density to that of a certain reference material. For gases, the reference is air at room temperature, specific gravity for liquids is almost commonly calculated in relation to water at its densest state.
Typically, a hydrometer is used to determine the specific gravity. In the liquid sample, the hydrometer is slightly submerged, and the reading on the scale at the air-water junction point is noted.
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Explain why phytoplankton grow father in shallow water than they do in the middle of the ocean?
Answer:
Water temperature is a key factor affecting phytoplankton bloom dynamics in shallow productive coastal waters and could become crucial with future global warming by modifying bloom phenology and changing phytoplankton community structure, in turn affecting the entire food web and ecosystem services.19 Mar 2022
Explanation:
Phytoplankton grow well in estuaries where water is trapped within warm, shallow areas and sunlight, carbon dioxide, and other nutrients needed for growth are plentiful.20 May 2021
1.Researchers wanting to stimulate
distinct, specific emotions would be most
successful if they could do which of the
following?
a. manipulate heart rates
b. change internal body temperature
c. stimulate different brain regions
d. modify the secretion of adrenaline
Answer:
C. Stimulate different brain regions.
Explanation:
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Like the success of animals, the success of plants is limited based on the resources available to each individual. In the tropical rainforest, plants are especially limited by the space they have available to grow and reproduce. Which of these statements describes a wav that limited space will impact the success of a plant in the rainforest? A. A plant without enough space will face increased predation from herbivores. B. A plant without enough space will not have as many parasites and diseases. - C. A plant without enough space will not be able to capture enough light to grow. -(D) A plant without enough space will be more likely to be impacted by air quality.
The statements - C. A plant without enough space will not be able to capture enough light to grow describes a way that limited space will impact the success of a plant in the rainforest.
What is the relationship between space and photosynthetic rate?The relationship between space and the photosynthetic rate is based on the fact plants need space to absorb light which is a reactant during photosynthesis.
Therefore, with this data, we can see that the relationship between space and photosynthetic rate is directly proportional in the sense that plants use space to photosynthesize.
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In ecological terms, disturbance is an event such as a storm, fire, or human activity that changes a community, removing organisms and altering resource availability. Which of the following statements about the effects of disturbance is correct? Disturbances can create patches of different habitats in a community.As a result of disturbance, biomes often exhibit extensive patchiness, with several different communities represented in a single area. This increases biodiversity within the biome. Read about disturbance and terrestrial biomes.
In ecological terms, disturbance is an event such as a storm, fire, or human activity that changes a community, removing organisms and altering resource availability. Disturbances can create patches of different habitats in a community.
Ecosystems are dynamic systems that are continually in the process of recovering from previous disturbances and prone to recurring disruptions. Resistance is a phrase used to describe an ecosystem's propensity to hold onto a condition that is relatively close to equilibrium notwithstanding a disruption. Ecological resilience is the ability of a system to withstand change while adapting to disturbance and reorganise in order to maintain essentially the same function, structure, identity, and feedbacks. Theoretical research, long-term ecosystem monitoring studies, comparative studies that focus on the contrasts between ecosystems to better understand how they function, and direct manipulative experimentation are just a few of the methods that can be used to study ecosystems. Among ecosystems, biomes can be thought of as a generic class or category.
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How would you distinguish the micromolecule and macromolecule
A micromolecule is a small molecule with a molecular weight of less than 1000 daltons, while a macromolecule is a large molecule with a molecular weight of more than 1000 daltons.
Micromolecules are composed of a small number of atoms and include compounds such as sugars, amino acids, and nucleotides. They can be easily dissolved in water and do not require much energy to break apart. They also tend to be relatively stable and do not typically undergo significant changes in their structure.
Macromolecules, on the other hand, are composed of a large number of atoms and include compounds such as proteins, carbohydrates, and nucleic acids. They tend to be insoluble in water and require a significant amount of energy to break apart. They also tend to be less stable and are more prone to undergoing changes in their structure.
Another way to distinguish micromolecules and macromolecules is by looking at their chemical properties. Micromolecules are typically organic compounds, while macromolecules are typically polymers, composed of repeating units.
Therefore, the main difference between micromolecules and macromolecules is their size, macromolecules are larger than micromolecules, and their chemical properties, micromolecules are small organic compounds, while macromolecules are large polymers.
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. Why is immersion oil necessary at 1,000´ but not with the lower power objective?
Since the light refraction from lower power magnification microscope objective lenses, such as those with a 10X and 40X magnification, is insignificant and undetectable, oil immersion is utilized in microscopes for their maximum power objectives. However, with 100X magnification microscopes, light refracted is significant and high.
what is light refraction?Refraction in physics is the redirection of a wave as it travels through one medium and then another. A change in the medium or a change in the wave's speed might both result in the redirection.
what is magnification?Magnification is the process of enlarging something's apparent size rather than its actual size. This enlargement is measured in terms of a calculated quantity known as "magnification." The term "minification" or "de-magnification" is frequently used to describe a reduction in size when this number is less than one.
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in photosynthesis, light energy is used to split water molecules and pump hydrogen ions into the inner thylakoid membranes of the chloroplast. which of the following statements best explains the purpose for creating a high concentration of ions inside the inner membrane?
The ATP synthase uses this proton gradient to generate a proton-motive force, which it then uses to manufacture ATP.
The two successive steps of light-dependent reaction and light-independent reaction make up the photosynthesis process. During photophosphorylation, where cytochrome b6f and ATP synthase collaborate to make ATP, the H+ ion (Proton) gradient is formed. Non-cyclic photophosphorylation creates a proton gradient across the thylakoid membrane by pumping H+ ions from the stroma to the lumen using electrons created by PS 2. The ATP synthase uses this proton gradient to generate a proton-motive force, which it then uses to manufacture ATP. In cyclic photophosphorylation, cytochrome b6f harnesses the energy of PS2 and PS1 electrons to produce ATP while limiting NADPH synthesis.
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small subunit rrna gene sequencing has become a method of choice for both blank . multiple select question. inferring the phylogeny of microorganisms determining the metabolic pathways used by microorganisms assigning microbes to taxonomic groups comparing the genomes of microorganisms
Small subunit rRNA gene sequencing has become a method of choice for both identification of microorganisms to the genus level inferring the phylogeny of microorganisms. Thus, option D is correct.
What is phylogeny?The phylogeny of a species or group describes its evolutionary development. Currently, the earth is home to about 100 million species. All the organisms are likely genetically related, according to morphological and biochemical evidence.
In the form of an evolutionary tree known as a phylogenetic tree, the genealogical connections between the organisms can be depicted. This is organised with the species or groups in a way that makes it easier to understand how they diverged from a common ancestor.
We can learn more about the evolution of species, genomes, and genes thanks to phylogeny. Numerical and theoretical applications can both benefit from it.
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Full question:
Small subunit rRNA gene sequencing has become a method of choice for both
a. identification of microorganisms to the genus level
b. differentiating strains of microorganisms
c. genomic comparisons of microorganisms
d. inferring the phylogeny of microorganisms
A solution of starch at room temperature does not readily decompose to form a solution of simple sugars becausea. the activation energy barrier for this reaction cannot be surmountedb. starch cannot be hydrolyzed in the presence of so much waterc, starch hydrolysis is nonspontaneousd. the starch solution has less free energy than the sugar solutione. the hydrolysis of starch to sugar is endergonic
A solution of starch at room temperature does not readily decompose to form a solution of simple sugars because the activation energy barrier for this reaction cannot be surmounted.
At room temperature, starch is often not soluble in water. Because of this, starch occurs naturally in the form of tiny granules that can be seen under a microscope and is stored in cells. Due to the creation of hydrogen bonds between adjacent molecules and within the same molecule, starch granules are very resistant to being dissolved by water and hydrolytic enzymes. However, if the suspension's temperature is increased, these intra- and inter-hydrogen bonds may weaken. Heat breaks hydrogen bonds, water is absorbed, and the starch granules enlarge in an aqueous solution of starch. Due to the gelatin, extremely viscous quality of the solution created, this process is frequently referred to as gelatinization. The same method has traditionally been used in food preparation to thicken soup.
complete question:A solution of starch at room temperature does not readily decompose to form a solution of simple sugars because
a. the starch solution has less free energy than the sugar solution.
b. the hydrolysis of starch to sugar is endergonic.
c. the activation energy barrier for this reaction cannot be surmounted.
d. starch cannot be hydrolyzed in the presence of so much water.
e. starch hydrolysis is nonspontaneous.
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after looking at the bloodstains in the figure, answer the following questions: which three drops struck the surface closest to a 90-degree angle? explain your answer. which three drops struck the surface farthest from a 90-degree angle? explain your answer. in what direction were drops 2 and 7 traveling when they struck the surface? explain your answer.
We can safely assume that, in a clear reflection, the light will return to the substance at the same angle that it first touched it.
When light strikes a smooth, transparent surface, like a mirror, it reflects in this way. When this occurs, the light bounces back off the medium at an angle that is equal to the angle at which it first struck the material. As a result, light will reflect off a mirror at an angle of 40 degrees if it strikes it at that angle. We can therefore affirm that, in a clear reflection, the light will bounce back at an angle that is equal to the angle at which it first struck the substance, in this case a 40-degree angle. We can safely assume that, in a clear reflection, the light will return to the substance at the same angle that it first touched it.
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Describe the three layers of tissue in arteries and veins. Then explain how the structure of arteries and veins relates to their functions.
The three layers of tissue in arteries and veins are Tunica adventitia, Tunica media and Tunica intima.
The arteries role is to carry the oxygenated blood from the heart to the rest of the body and the role of veins is to carry deoxygenated blood from the various parts of the body to the heart.
The outermost layer of the arteries and veins is tunica adventitia, its role is to expand and contract and maintains the blood pressure, it also plays a role in protection.
The middle layer called tunica media and is made up of elastin and muscle fibres.
inner most is called as tunica intima, it has valves which help blood move in a particular direction.
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name the cells that produce bile, synthesize blood components, and perform interconversion of nutrients.
Hepatocytes. The primary parenchymal cells, hepatocytes, are involved in protein synthesis, detoxification, and metabolism.
By secreting innate immunity proteins, hepatocytes also stimulate innate immunity against invasive pathogens. These proteins include bactericidal ones that kill bacteria directly, opsonins that help phagocytoze foreign bacteria, iron-sequestering ones that prevent bacteria from absorbing iron, a number of soluble ones that control lipopolysaccharide signalling, and the coagulation factor fibrinogen that stimulates innate immunity.
A cell of the liver's primary parenchymal tissue is known as a hepatocyte. 80% of the liver's bulk is made up of hepatocytes. These cells participate in:
Protein productionstorage of proteincarbohydrate transformationCreation of bile salts, phospholipids, and cholesterolExogenous and endogenous drug detoxification, modification, and excretionbeginning of bile production and secretion.Learn more about cell here:
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every time you have a cold, you drink orange juice and feel better within a day. this leads you to formulate the hypothesis that the vitamin c in orange juice reduces the duration and severity of the symptoms of the common cold. what is your null hypothesis? vitamin c increases the duration and severity of the symptoms of the common cold. consuming juice of any kind decreases the duration and severity of the symptoms of the common cold. consuming juice has no effect on the duration and severity of the symptoms of the common cold. all of the answer options are correct. vitamin c has no effect on the duration and severity of the symptoms of the common cold.
According to research, consuming 1,000 mg and 2,000 mg dose of vit C on a regular basis may lessen the duration and intensity of cold symptoms.
When you're unwell, does orange juice help you feel better?Orange juice is a delicious way too hydrate, but there is mixed evidence regarding its ability to treat colds. A sore or swollen throat may get irritated by the acid. In addition to being rich in sugar, many orange drinks sold in stores are not advised for treating symptoms.
What benefits does vitamin C offer?All bodily tissues need vitamin C, commonly referred to as ascorbic acid, to grow, develop, and heal. It has a role in a variety of bodily processes, such as collagen synthesis, iron absorption, and immune system health healing of wounds and the preservation of teeth, bones, and cartilage.
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the species endemicity and richness increase or decrease with increasing of altitude?
Answer:
Research suggests that species endemism and richness generally increase with increasing altitude. This is because of the greater range of different habitats and niches available in higher altitudes, which provides more opportunities for species to specialize and develop local adaptations. Additionally, the climate in higher altitudes tends to be more extreme, creating more opportunities for species to evolve and diversify in response to the changing conditions.
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What is the role of the SRY gene in humans?A. None of the answers is correct.B. It is located on the X chromosome and causes the X to pair with the Y chromosome during male meiosis.C. It initiates the X inactivation process in females.D. It is located on an autosomal chromosome and represses expression of autosomal genes in order to balance their expression level with genes on the X chromosome.E. It is located on the Y chromosome and initiates the developmental pathway toward the male phenotype.
The role of the SRY gene in humans E. It is located on the Y chromosome and initiates the developmental pathway toward the male phenotype.
The gene SRY (sex-determining region of the Y), located at the distal region of the short arm of the Y chromosome, is necessary for male sex determination in mammals. SRY initiates the cascade of steps necessary to form a testis from an undifferentiated gonad. The SRY gene encodes an HMG (High Mobility Group) protein which may act as a transcription factor by binding to double-stranded DNA and then bending the DNA. Mutations in SRY have been identified in some subjects with 46, XY pure gonadal dysgenesis.
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What is the diffrence between someone who is homozygous for a trait and someone who is heterozygous for a trait?
studying the relationships between organisms and their life processes can help scientists gain a better understanding of the history of life on earth. which of the following best describes the relationship between protists and prokaryotes? A) Protists can photosynthesize, which evolutionary scientist believe suggests they evolved before prokaryotes.
B) Prokaryotes are less complex than protists, which evolutionary scientist believe suggests they have different genetic codes.
C) They are both unicellular, which evolutionary scientist believe suggests they share similar methods of reproduction.
D) They both undergo transcription and translation, which evolutionary scientist believe suggests they share a common origin.
Studying the relationships between organisms and their life processes can help scientists gain a better understanding of the history of life on Earth. They both undergo transcription and translation, which evolutionary scientist believe suggests they share a common origin- describes the relationship between protists and prokaryotes.
What is transcription?
A DNA segment is copied into RNA during transcription. Messenger RNA is created when specific DNA sequences are translated into RNA molecules that can encode proteins (mRNA). Non-coding RNAs are RNA molecules that contain copies of other DNA sequences (ncRNAs). Only 1% to 3% of all RNA samples are mRNA. A minimum of 80% of mammalian genomic DNA can be actively transcribed (in one or more types of cells), with the bulk of this 80% being ncRNA. In contrast, less than 2% of the human genome can be transcribed into mRNA (see Human genome Coding vs. noncoding DNA).
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A researcher who focuses on the interactions between organisms and their environments ecology.
What is the study of the relationship between living organisms?Biology's field of ecology focuses on the interactions between species and their environments as well as the links that exist between them.The study of the similarities and differences between the skeletal systems of various species is known as comparative anatomy. Homologous or comparable structures are two terms used to describe similar body parts. Both show that evolution has occurred.Living things rely on one another and the settings, or habitats, in which they are located to meet their basic needs. We refer to this as dependency. One approach to illustrate interdependence is through a food chain. A food chain demonstrates the flow of energy from one organism to another.Any contact or relationship between two biologically distinct species is referred to as symbiosis. The type of symbiosis that develops relies on whether one or both species gain an advantage from the partnership.To learn more about ecology refer to:
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In echinoderms, the water vascular system is a system of closed, fluid filled tubes and ducts that connect to tube feet which act like suction cups.
The water vascular system is the main organ system used by echinoderms to move, feed, and respire. The water vascular system is also used to aid in respiration, as water is taken in, filtered, and then expelled from the body.
What is vascular system?
The vascular system is a network of vessels and organs that circulates blood throughout the body. It is made up of the heart, veins, arteries, and capillaries. The heart pumps the blood, which is composed of red blood cells and dissolved oxygen, nutrients, and hormones. Veins carry oxygen-poor blood back to the heart. Arteries carry oxygen-rich blood away from the heart. Capillaries are small vessels that connect the veins and arteries and allow for the exchange of gases, nutrients, and waste products between the blood and the body's cells.
The system is made up of a network of canals and sacs that are filled with water, and the pressure of this water is used to extend and retract the tube feet. The tube feet are used to attach the animal to substrates and to move food particles towards the mouth.
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According to the cross-bridge model of muscle contraction, the muscles stiffen after death because ATP is unavailable to bind and directly release:
A.ADP from the actin head.
B.ADP from the myosin head.
C.the actin head from the myosin filament.
D.the myosin head from the actin filament.
The muscles stiffen following death when ATP is unable to bind and immediately withdraw the myosin head from of the actin filament, in accordance with the cross-bridge hypothesis of muscle contraction.
Actin filaments: what are they and what serve they do?Microfibrils are widely distributed under the biomembranes, where those who create a structure that can give mechanical support, regulate cell shape, and allow migrations of the cell surface. This enables dividing, migrating, and ingesting cells.
What substances comprise actin filament?Actin filaments are made up of identical cytoskeleton proteins that are arranged in an unique spiral strand. Actin filaments have positive and negative ends, similar to cytoskeletal filaments, with the plus terminus of a filament undergoing more ATP-powered proliferation. Myosin proteins place strains on the straight-ahead position of thin filaments.
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