Bacteria, archaea, algae, protozoa, and drifting or swarming organisms that live in brackish estuaries and salty oceans are examples of marine plankton. Similar to sea plankton, freshwater plankton is a type of algae that lives in lakes and rivers.
Plankton are organisms that are present in water or the air but are unable to push against a stream (or wind). The individual organisms that make up plankton are known as plankters. They are essential for the survival of numerous small and big aquatic organisms, including fish, whales, and bivalves.
Planktons are categorized according to their lifecycles as follows:
Holoplankton - Organisms such as algae and jellyfish, that remain in a planktonic state throughout their whole lives.
Meroplankton - It is an organism that only exists as plankton during some phases of its life cycle, such as the larvae of starfish, worms, sea urchins, fish, etc.
According to their size, planktons are divided into:
Megaplankton - They are larger than 20 cm in size, such as jellyfish, tunicates, pyrosomes, etc.
Macroplankton - They range in size from 2 to 20 cm.
Mesoplankton – organisms ranging in size from 0.2 to 20 mm.
Microplankton – their size range from 20 to 200 m and include huge protists, protozoans, and the majority of phytoplankton.
Nanoplankton – size spans from 2 to 20 m, including protists, diatoms, and algae
Picoplankton – size range from 0.2 to 2 meters,such as bacteria and chrysophytes.
Femtoplankton – Viruses in the marine femtoplankton with a size of less than 0.2 m.
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Describe 3 ways new strains of bacteria may develop.
Answer:
1) Mutations: Bacterial mutations can occur spontaneously and alter the DNA of the bacterium, leading to changes in its characteristics and potentially leading to the development of a new strain.
2) Horizontal gene transfer: Bacteria can exchange genetic material with other bacteria through mechanisms such as conjugation, transduction, or transformation. This can result in the transfer of virulence factors, antibiotic resistance genes, or other traits that contribute to the development of new strains.
3) Antibiotic resistance: The overuse and misuse of antibiotics can lead to the selection and spread of antibiotic-resistant strains of bacteria. This can result in the emergence of new strains that are resistant to multiple antibiotics and pose a significant public health threat.
Complete the following vocabulary exercise relating to the level of structure in proteins.
Match the words in the left-hand column with the appropriate blank in the sentences in the right-hand column.
1. When a protein folds into a small, three-dimensional shape that is stabilized by interactions between side-chain R groups of amino acids, this is known as tertiary structure.
What in biology is a tertiary structure?Secondary protein architecture. The secondary structure is folded into various configurations called as domains to form the tertiary structure. Because of the characteristics of the side chains of the amino acids, this happens spontaneously in cells in a matter of seconds.
2. When two or more protein subunits come together to form a bigger, physiologically active protein complex, quaternary structure is the result.
3. A protein's primary structure is its amino acid sequence.
4. The alpha-helices and beta-sheets that are created by hydrogen bonds between backbone atoms that are close to one another in the polypeptide chain are referred to as secondary structure.
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Do homozygous dominant and heterozygous organisms for a specific trait have different genotypes?
When a gene is homozygous, the outcome is always pure for that trait and breed. An individual that is heterozygous isn't pure, and their progeny typically has diverse genotypes.
An individual who is homozygous can have either a dominant or recessive allele, but only one at a time. When an individual is heterozygous, they may have both a dominant and a recessive allele. While heterozygotes can create two different types of gametes, homozygotes only produce one type of gamete. Each allele of a specific gene is different when a person is heterozygous; one allele is recessive and the other is dominant. Each gene is present in two distinct copies in the diploid organism.
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What do we call a need or desire that energizes and directs behavior?a. Incentiveb. Refractory periodc. Emotiond. Motivatione. Instinct
According to their definition, motivation is a need or want that animates and controls conduct. It results from how nature and nurture interact. A need as well as desire that energises conduct and guides it towards a goal is referred to as motivation.
2. According to instinct theory, every member of a certain species exhibits genetically programmed tendencies.
A need as well as desire that energises conduct and guides it towards a goal is referred to as motivation.
Emotions are mental and physical states of feeling that control our attention and behaviour.
According to the Instinct Theory of Motivation, motivation is caused by biological or genetic programming. This statement implies that because of our shared biological programming, all people have the same motivations. According to this theory, the desire to survive lies at the core of all motivations. a motivational really need and desire that controls conduct.
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Thermoregulation maintains the human body at about ___
98.6° F (37° C). The biological mechanism of thermoregulation maintains a consistent internal body temperature.
The thermoregulation system is composed of the hypothalamus in the brain, sweat glands, the epidermis, and the circulatory system. The average body temperature of a human is 98.6°F (37°C), which is maintained through a number of physical processes.
Examples include contracting or relaxing blood vessels to alter blood flow, shivering to increase body temperature, sweating to lower it, and so on.
If one is unable to regulate their body temperature, they may overheat and have hyperthermia. The converse is also true: If the core temperature falls too low, hypothermia will set in. These illnesses have the capacity to be fatal.
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what are some impacts humans may have on the abiotic and biotic factors of a marine ecosystem?
Human activities are altering the ph of the oceans causing major disturbance to many living organisms, w have also destabilised the coral reefs and almost distroyed other arts of marine ecosystem too
What are marine ecosystems?The largest aquatic ecosystems on Earth, marine ecosystems are found in waters with a lot of salt. These environments stand in contrast to freshwater ecosystems, which contain less salt. More than 70% of the Earth's surface is covered by marine waters, which also provide more than 97% of the planet's water supply and 90% of its habitable area. The salinity of seawater is 35 parts per thousand of water on average. Varying marine environments have different actual salinities depending on the water depth and coastline features, marine ecosystems can be separated into a variety of zones. The huge, open area of the ocean known as the oceanic zone is home to creatures like whales, sharks, and tuna. Many invertebrates live on substrates in the benthic zone, which lies below the water.
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in marigolds, the allele for golden flowers (g) is dominant over the allele for orange flowers (g). if an orange marigold is crossed with a heterozygous golden marigold, what is the chance of having golden offspring?
The chance of having golden offspring is 50%.
If an orange marigold is crossed with a heterozygous golden marigold, the possible genotypes and corresponding phenotypes of the offspring are:
50% chance of offspring with the genotype Gg, which will have golden flowers (heterozygous golden)
50% chance of offspring with the genotype gg, which will have orange flowers (homozygous orange)
This is because the orange marigold parent can only contribute a g allele, while the heterozygous golden marigold parent can contribute either a G or a g allele.
The probability of each possible genotype can be calculated using Punnett squares or other methods of genetic analysis.
Therefore, there is a 50% chance of having golden offspring in this cross.
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What is the concentration of a NaCl solution if 86. 00 g of solute was dissolved in enough water to form 1000. Ml of solution?
To determine the concentration of the NaCl solution, we need to divide the mass of the solute (NaCl) by the volume of the solution. The concentration of the NaCl solution is 86.00 g/L.
However, we need to make sure that the units are consistent.
First, we need to convert 1000 mL to liters (L):
1000 mL = 1000/1000 L = 1 L
Next, we can calculate the concentration (C) in units of grams per liter (g/L):
C = mass of solute (g) / volume of solution (L)
C = 86.00 g / 1 L
C = 86.00 g/L
Therefore, the concentration of the NaCl solution is 86.00 g/L.
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Cartilage repairs slowly after adolescence because__A. chondrocytes no longer are able to divide.B. storage of parathyroid hormoneC. perforating fibers of collagen attach the tendons and periosteum to the cortical surfaces of bone.D. layers of bone lamellae surrounding a central canal.
The correct answer is option A. Cartilage repairs slowly after adolescence because chondrocytes no longer are able to divide.
Cartilage heals slowly after adolescence because chondrocytes (cartilage cells) stop dividing at this time. This is because the structure of the cartilage does not change significantly once a person reaches maturity, making it unnecessary to divide cells.
Age also dramatically lowers the quantity of chondrocytes, which inhibits the capacity of the tissue to repair.
As a result, any cartilage damage sustained beyond puberty is far more difficult to cure and may possibly result in permanent damage.
Furthermore, because cartilage lacks blood arteries, it has limited access to the nutrients and oxygen it requires to heal itself. This slows down the healing process even further.
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calculate the free energy of hydrolysis of atp in a rat liver cell in which the atp, adp, and pi concentrations are 3.4, 1.3, and 4.8 mm, respectively
The free energy of hydrolysis of ATP can be calculated using the equation [tex]ΔG = ΔG° + RTln([ADP][Pi]/[ATP])[/tex].
The free energy of ATP hydrolysis in the rat liver cell would be calculated using the conventional free energy change of G° = -12 kcal/mol as follows:
[tex]ΔG = ΔG° + RTln([ADP][Pi]/[ATP])[/tex]
ln(1.3 mM * 4.8 mM / 3.4 mM) = -12 kcal/mol + (1.987 cal/mol*K) * (298 K) = -12 kcal/mol + -7.2 kcal/mol = -19.2 kcal/mol
In this specific cell, the hydrolysis of ATP would produce a free energy of -19.2 kcal/mol. This f is an estimate based on the presumption that the values provided appropriately reflect the temperature and the concentrations of the reactants and products. a number of variables, including the pH, the presence of enzymes, and other metabolic activities occurring inside the cell, might affect the free energy change.
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based on the results of your blood type test, what is your genotype for the abo alleles? is there more than one possible genotype you might have, and if so, why?
The possible alleles in the ABO system are A, B, and O. A and B are co-dominant, meaning they both express their phenotype when present. O is recessive, meaning it is only expressed when both alleles are O. Thus, the possible genotypes are AA, AO, BB, BO, AB, and OO.
When an individual undergoes a blood type test, their blood is screened for the presence of A and B antigens on the surface of their red blood cells. Additionally, their blood serum is tested for the presence of antibodies against A and B antigens. Based on the results of these tests, an individual's blood type can be determined and their genotype can be inferred.
For example, if an individual has blood type A, their genotype could be either AA or AO. If they have blood type B, their genotype could be either BB or BO. If they have blood type AB, their genotype must be AB, as this is the only possible genotype that expresses both A and B antigens. Finally, if an individual has blood type O, their genotype must be OO, as this is the only genotype that does not express A or B antigens.
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how can changes in a population lead to new species? ~home edition model 1 - allopatric speciation geographic isolation is an isolating mechanism in nature. over long periods of time, it can lead to speciation. as the name suggests, geographic isolation is when populations of a species become separated geographically. this could also happen from the founder effect, where a small group breaks away from a larger population and establishes a group in an isolated area. isolation could also occur when a geographic event, like an earthquake or a landslide separates a population. once the populations are separated evolution can occur through multiple mechanisms. natural selection could act on each population, where some individuals have favorable traits for survival. genetic drift can occur, where genotypes become more common due to random chance. these mechanisms can lead to each subpopulation becoming so different, that they can no longer interbreed and are considered separate species.
Ultimately, inheritable drift can beget a subpopulation to come genetically distinct from its new species.
Indeed, over a long period of time, inheritable drift and the accumulation of other inheritable changes can affect in speciation, which is the elaboration of a new species. geographic insulation is an segregating medium in nature. over long ages of time, it can lead to speciation. as the name suggests, geographic insulation is when populations of a species come promised geographically.
This could also be from the author effect, where a small group breaks down from a larger population and establishes a group in an isolated area. insulation could also do when a geographic event, like an earthquake or a landslide separates a population. formerly the populations are separated elaboration can do through multiple mechanisms.
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what abnormal growths make tissue can be cancerous or benign?
An abnormal mass of tissue that forms when cells grow and divide more than they should or do not die when they should can make tissue cancerous and benign.
A cyst can form in any part of the body, including bones, organs and soft tissues. Most cysts are noncancerous (benign), but sometimes cancer can cause a cyst. Whereas a tumor is any abnormal mass of tissue or swelling.
Tumors can form throughout the body. They can affect bone, skin, tissues, glands and organs. Neoplasm is another word for tumor.
Your body is constantly making new cells to replace old or damaged ones that die off. Sometimes, the cells don’t die off as expected. Or, new cells grow and multiply faster than they should. The cells start to pile up, forming a tumor.
Tumors affect people of all ages, including children. Factors that increase the chances of developing a tumor include:
Gene mutations (changes), such as mutated BRCA (breast cancer) genes.Inherited conditions, such as Lynch syndrome and neurofibromatosis (NFS).Family history of certain types of cancer like breast cancer or prostate cancer.Smoking, including exposure to secondhand smoke.Exposure to toxins like benzene or asbestos.Previous radiation exposure.Viruses like HPV.Having obesity.To know more about cancer, click here:
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Need this with this for my homework
Answer:
The 2nd choice would be the correct answer.
Explanation:
Abiotic is referring to non-living.
thermoregulation maintains the human body at about____
Thermoregulation is the process by which the human body maintains a relatively constant internal temperature, regardless of changes in the external environment.
The normal human body temperature is typically maintained at around 37°C (98.6°F). This temperature is maintained by a balance between heat production and heat loss. When the body's internal temperature rises above the normal range, such as during exercise or exposure to a hot environment, the body responds by increasing heat loss through sweating and vasodilation (widening of blood vessels in the skin). When the body's internal temperature falls below the normal range, such as during exposure to a cold environment, the body responds by decreasing heat loss through vasoconstriction (narrowing of blood vessels in the skin) and shivering, which generates heat. While the normal body temperature is around 37°C, it's important to note that individual variations can occur. Body temperature can fluctuate slightly throughout the day, and can also be affected by factors such as illness, hormonal changes, and medications. However, the body's thermoregulatory system works to maintain a relatively constant internal temperature, which is critical for the proper functioning of many physiological processes in the body.
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which one of the following can lead to changes in chromatin structure and is often associated with activation of transcription?
Addition of methyl or acetyl groups to lysines located in the histone tail can lead to changes in chromatin structure and is often associated with activation of transcription .
DNA becomes less accessible to transcription factors as chromatin is compressed into the main nucleosome form. However, when this chromatin structure becomes more lax, transcription is encouraged because the access of the transcription machinery to the genomic DNA is improved.
All RNA polymerase II-mediated features of transcription are significantly hampered by chromatin shape. Through a number of mechanisms, such as histone modification, chromatin remodelling , histone variant inclusion, and histone eviction, the dynamics of chromatin structure are closely regulated. Heterochromatin structure can change as a result of epigenetic alterations to histone proteins, such as acetylation and deacetylation, which can activate or repress transcription. The compound of DNA and proteins found in eukaryotic cells' nuclei is called chromatin. Thus, chromatin modifications are necessary for gene expression.
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explain kepler's laws of ellipse
Answer:Kepler's three laws describe how planetary bodies orbit the Sun. They describe how (1) planets move in elliptical orbits with the Sun as a focus, (2) a planet covers the same area of space in the same amount of time no matter where it is in its orbit, and (3) a planet’s orbital period is proportional to the size of its orbit (its semi-major axis).
Explanation:??
a forest fire consumes a forest of pine trees. one year later a few pine seedlings begin to appear. what stage of ecological succession is being seen? a climax community b pioneer organisms c primary succession d secondary succession
The forest ecosystem is always changing as a result of ecological succession, which is an ongoing, never-ending process. When a natural disturbance, such as a storm or fire, clears a region, the successional process might start afresh. Commenting is disabled.
Ecological succession is the process by which a community's species composition changes over time. The duration can range from a few years to many decades (for instance, following a wildfire). The cycling of nutrients like carbon, nitrogen, and sulphur is made possible by bacteria. The community evolves through an increase in complexity from a small group of pioneering plants and animals to a stable or self-sustaining climax community. The effects of established organisms on their own habitat serve as the "engine" of succession and the reason why ecosystems change. Life has an impact on one's surroundings, sometimes subtly and other times explicitly.
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What can be inferred from observed similarities in the forelimbs of humans, dogs and bats?A. These organisms share a common ancestor.
B. The animals share a similar ancestor.
C. The similarities in their body structures
D. Pig and human
Answer: answer is A
Explanation:
acid rain damages trees in which of the following manners? group of answer choices removes soil nutrients dissolves roots causes bark to fall off
OptionA, removes soil nutrients. Acid rain does not directly damage trees. As a result, trees are more likely to become weaker by having their leaves damaged, having fewer nutrients accessible to them.
Acid rain damages trees by weakening them through a variety of means. Acid rain can damage leaves, which can lead to reduced photosynthesis and less energy for the tree to grow and defend itself. It can also wash away important nutrients from the soil, such as calcium and magnesium, which are necessary for healthy tree growth. Additionally, acid rain can release toxic substances from the soil, such as aluminum, which can further damage tree roots and limit their ability to absorb water and nutrients. Over time, these effects can lead to weakened trees that are more susceptible to disease and pests.
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The complete Question is:
Acid rain damages trees in which of the following manners?
A ) removes soil nutrients
B ) causes bark to fall off
C ) dissolves roots
In the case of humans, we have _________ pairs of chromosomes which determine the details of our _________________________
In the case of humans, we have 23 pairs of chromosomes which determine the details of our genetic makeup, including our physical characteristics, susceptibility to certain diseases, and other traits.
Each pair of chromosomes consists of one chromosome inherited from the mother and one from the father. Of the 23 pairs of chromosomes, 22 pairs are called autosomes, while the 23rd pair is the sex chromosomes (XX in females and XY in males), which determine an individual's biological sex.
The information encoded in the DNA sequences of our chromosomes is responsible for the development and maintenance of our bodies, including the production of proteins that carry out many essential functions. Genetic variations in our chromosomes can lead to differences in traits and characteristics between individuals, and some variations can increase the risk of certain diseases.
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morgan has recessive genes for blue eyes; her parents have brown eyes . what color is morgan's eye color?
Morgan's parents both have brown eyes, however, she carries a recessive gene for blue eyes. then Morgan's eye color is likely to be blue.
If Morgan has recessive genes for blue eyes, then both of her parents must be carriers of the recessive gene, which means they both have at least one copy of the gene for blue eyes. However, since brown eyes dominate over blue eyes, Morgan's parents have brown eyes despite carrying the gene for blue eyes. Assuming that Morgan inherited one copy of the recessive gene for blue eyes from each of her parents, then she would have two copies of the recessive gene, giving her blue eyes. Therefore, Morgan's eye color is likely to be blue.
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you examine a tissue sample under the microscope and discover that the tissue appears to be striated muscle. what can be concluded from this observation?
Skeletal muscle is the sole form of multinucleated muscle tissue. This is congruent with response choice "a". Skeletal muscle is also characterized by being long, unbranched, striated, and bearing a t-tubule system.
The only muscle tissues that exhibit striations are the skeletal and cardiac muscles, yet their activities are fundamentally different. The cardiac muscle is not voluntary, but the skeletal muscle is.
Many people associate all of this with their treating physician when it comes to the diagnosis and treatment of diseases. There is a lot that goes into identifying an illness, and pathology and histology play a big part in that.
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Full Question;
While examining a sample of muscle tissue under a microscope, you notice that the cells are multinucleated. They are long, unbranched, striated, and contain a developed transverse tubule system. Which muscle type does this sample contain?
a. Skeletal muscle.
b. Smooth muscle.
c. Cardiac muscle.
d. Striated muscle.
which process could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings?
option b) Active transport is the process that could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings.
Active transport is a type of movement that goes from where the electrochemical potential is lower to where the electrochemical potential is higher.
That is, it is the transport of a substance against its electrochemical gradient with energy input from ATP.
The driving force is linked, here, to the energy derived from cellular metabolism, this energy is provided by the hydrolysis of ATP or some other high-energy nucleotide.
The "pumps" that, at the level of the cell membrane transport Na +, for example, are the best known model.
Therefore, we can conclude that active transport is the process that could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings.
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Full Question: Which of the following processes could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings?
a. Osmosis
b. Active transport
c. Diffusion
d. Facilitated diffusion
how to damage guardian shields to collect dropped micro chips?
A lipid bilayer is a perfect structure in cell membranes due to several additional features besides its capacity for self-sealing. One of these that is most significant is fluidity, which is essential to numerous membrane processes.
Important elements of cell membranes are phospholipid bilayers. A barrier preventing molecules and ions from entering and leaving the cell is the lipid bilayer. The ability to selectively permit the passage of specific molecules into or out of cells, however, is a crucial function of a cell membrane. The cell wall let any molecule to pass through or leave the cell by screening them if indeed the cell membrane becomes broken. The cell will eventually die as a result of losing its ability to operate.
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an ecologist estimated 800 star-nosed moles, condylura cristata, per square mile in one woodlot and 1,600 per square mile in another woodlot. what was the ecologist comparing?
By estimating 800 star-nosed moles, Condylura cristata, per square mile in one woodlot and 1,600 per square mile in another woodlot, the ecologist was comparing the population density.
Condylura cristata is a mammal which is semi-aquatic and small animal found northern part of North America. These animals are known to have the best sense of touch. The snout of these moles is made up of 22 fleshy tentacles appearing in the shape of star.
Population density is defined as the measure of number or concentration of species per unit specific geographical area. The density is calculated by dividing the number of individuals by the size of the area. Here, 1600 moles per square mile depicts their population density.
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In horses, tan hair (H) is dominant over white hair (h). If a horse has white hair, which of the
following alleles must it have?
Answer:
Explanation:
dhg
geeg
Which of the following mRNA modifications are common in human cells? a) alternative splicing b) intron removal and exon joining c) 3 poly-A tail addition d) 5' cap addition e 5' cap addition, intron removal and exon joining, 3 poly-A tail addition and alternative el splicing
The most accurate answer is (e) 5' cap addition, intron removal and exon joining, 3 poly-A tail addition, and alternative splicing.
These four types of modifications are common in human cells and play a crucial role in regulating gene expression.
The 5' cap addition involves the addition of a modified guanine nucleotide to the 5' end of mRNA, which protects the mRNA from degradation and assists in translation initiation. Intron removal and exon joining is a process in which non-coding regions (introns) of pre-mRNA are removed and the remaining coding regions (exons) are joined together to form mature mRNA. The 3' poly-A tail addition involves the addition of a long chain of adenine nucleotides to the 3' end of mRNA, which plays a role in mRNA stability and nuclear export.
Alternative splicing is a process in which different combinations of exons within a pre-mRNA molecule are spliced together to generate multiple mRNA isoforms, leading to the production of multiple protein isoforms from a single gene. Alternative splicing is a common mechanism used to generate protein diversity in eukaryotes, and it is estimated that over 90% of human genes undergo alternative splicing.
In summary, all of the options listed are involved in mRNA processing to some extent, but the most comprehensive and accurate answer is e) 5' cap addition, intron removal and exon joining, 3 poly-A tail addition, and alternative splicing.
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Click and drag each label into the correct category to indicate whether the statement describes a substance to which the membrane is permeable or impermeable
Urea, oxygen, small polar molecules, carbon dioxide, and phosphate are all permeable substances.
Ions, big polar molecules, and proteins are not permeable.
It is made up of a lipid bilayer with proteins incorporated into it. Ions and organic molecules selectively pass through the cell membrane. Small uncharged polar molecules like water, glycerol, and ethanol can pass through it, as can small hydrophobic molecules like O2, CO2, N2, and benzene. Larger uncharged polar molecules like amino acids, glucose, nucleotides, and ions cannot pass through plasma membrane .
While non-permeable molecules require additional transport molecules to help them cross the plasma membrane, pore-forming molecules can freely move across it.
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The above question is incomplete. Check complete question below -
Click and drag each label into the correct category to indicate whether the statement describes a substance to which the membrane is permeable or impermeable-
Urea, carbon dioxide, large polar molecule, small polar molecule, ions, oxygen molecule, phosphate.
What advantage is gained by having so many steps in one signal transduction pathway?
Greater amplification of the signal
Greater size of genome to code for proteins
Increased number of proteins to be synthesized by the cell
Increased time interval between signal and response
The correct answer is option A. The main advantage gained by having so many steps in one signal transduction pathway is greater amplification of the signal.
Greater signal amplification is possible when a signal transduction pathway has numerous stages. As a cell progresses through the many phases of its life cycle, it has the ability to amplify and modify an external signal that it receives, often in the form of a tiny molecule.
Each step might make the signal stronger as it is sent from one molecule to the next. As a result, the cell can recognise even tiny signals and react correctly.
In addition, the pathway's several phases provide the cell with the ability to regulate the signal response and ensure that it is suitable and proportionate to the initial signal. The cell may make sure that it reacts correctly by boosting the signal and managing the response appropriately to any changes in the environment.
Complete Question:
What advantage is gained by having so many steps in one signal transduction pathway?
A. Greater amplification of the signal
B. Greater size of genome to code for proteins
C. Increased number of proteins to be synthesized by the cell
D. Increased time interval between signal and response
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