Explain the differences between the davson-danielli model and the singer-nicolson model.
Answers
The Davison–Daniella model dominated until Singer and Nicolson advanced the fluid mosaic model in 1972. The fluid mosaic model developed on the Davison–Daniella model by including transmembrane proteins and destroyed the previously-proposed flanking protein coatings that were not well-supported by empirical evidence.
What did the Davson-Danielli representative explain?
Hugh Davison and James Daniella presented the Davson-Danielli model, often known as the unimolecular model, in 1935 as a representation of the plasma membrane of a cell. The trilaminar and lipoprotinious phospholipid bilayer that lies between two layers of globular proteins is depicted in the model.
Who located the fluid mosaic model?
Singer and Nicolson created the fluid mosaic theory in the early 1970s. This paradigm states that lipids, proteins, and carbohydrates make up membranes. Phospholipids are the primary components of lipid membranes. Up until Singer and Nicolson introduced the fluid mosaic model in 1972, the Davson-Danielli model predominated. Transmembrane proteins were included to the fluid mosaic model, which was built on the Davson-Danielli model, and thus eliminated the previously hypothesized flanking protein coatings, which were not well supported by empirical data.
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Related Questions
during the water cycle, water evaporates, rises into the atmosphere, and eventually falls back to earth's surface as precipitation. what is the original source of energy that produces these changes
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When warmed by the sun, water on the surface of oceans and freshwater bodies evaporates, forming a vapor. Water vapor rises into the atmosphere, where it condenses, forming clouds. It then falls back to the ground as precipitation. Moisture can also enter the atmosphere directly from ice or snow.
The original source of energy for the water cycle is sunlight. It falls on the earth's surface and causes the water to evaporate.
As the sunlight falls on the surface of the earth's surface, the water in the oceans or water bodies evaporates and the glaciers sublimes which converts directly from solid to gas or vapor form.
The vapor rises up in the atmosphere and forms the clouds this process is known as condensation. These water vapors falls back to earth's surface by the process of precipitation or raining.
This is known as water cycle. Therefore, the answer for the given question is sun energy or sunlight.
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What is one way in which scientists get information about the evolutionary history of species?
A. by comparing organisms' body structures
B. by observing where organisms live
C. by observing what organisms eat
D. by studying how organisms move
Answers
A researcher placed a culture of cyanobacteria under green lights. Within a few weeks, the appearance of the cyanobacteria changed from green to red. The researcher claimed the color change in the culture was the result of an adaptation allowing greater photosynthesis. Which of the following provides the best reasoning to justify the researcher's claim? In green light, cyanobacteria that have more allophycocyanin molecules are more likely to survive and reproduce In green light, more chlorophyll a molecules are produced, reflecting more light to other cyanobacteria to be used for photosynthesis. In green light, cyanobacteria that have more phycocyanin molecules are less likely to survive and reproduce. In green light, more phycoerythrin molecules are produced, allowing more green light to be absorbed, thus increasing photosynthesis.
Answers
Cyanobacteria contain many different colourants. Green light causes the production of additional phycoerythrin molecules, which promotes photosynthesis by allowing more green light to be absorbed.
What exactly are cyanobacteria?Photosynthesis is the process through which the phylum of gram-negative bacteria known as cyanobacteria, or cyanophyta, generates energy. They are a member of a class of microorganisms that are related to bacteria and are capable of photosynthesis. They are believed to be the planet's first known prokaryotic life form.
What hues do cyanobacteria produce?Phycobiliproteins (phycoerythrin, phycocyanin, and allophycocyanin), carotenoids (lutein, lycopene, astaxanthin, and fucoxanthin), and scytonemin are some of the photosynthetic pigments employed by cyanobacteria.
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which is a characteristic or structure that contributes to mating success? group of answer choices beetle mandibles mating plug all of the above colorful structures
Answers
Mating plug is the characteristic or structure that contributes to mating success. Option B is correct.
There is no single answer to this question that applies to all species, as different species may have different structures or characteristics that contribute to mating success. However, among the options given, both beetle mandibles and colorful structures can be characteristics or structures that contribute to mating success in some species.
In some species of beetles, males use their mandibles in combat with rival males to gain access to females for mating. Therefore, larger or more impressive mandibles can give males an advantage in mating competition.
Similarly, in many species, colorful structures such as feathers, scales, or skin can be important for attracting mates. Bright and contrasting colors can signal good health, genetic quality, or fitness, and can be used in courtship displays to attract and impress potential mates.
Mating plug, on the other hand, is a structure found in some species where males deposit a substance or structure to physically block the female reproductive tract after mating.
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--The given question is incomplete, the complete question is
"Which is a characteristic or structure that contributes to mating success? group of answer choices A) beetle mandibles B) mating plug C) all of the above D) colorful structures"--
According to the food web below, what is the phytoplankton?
Answers
What is the Difference Between RNASE A and RNASE ?
Answers
RNASE A and RNASE are two different types of ribonucleases, which are enzymes that break down RNA molecules. The main difference between the two is their structure and specificity.
RNase A and RNase are both enzymes found in cells. RNase A is a ribonuclease that specifically cleaves single-stranded RNA molecules into their component nucleotides, while RNase is a non-specific enzyme that can cleave both single-stranded and double-stranded RNA molecules.
The main difference between them is the specificity of their action - RNase A cleaves only single-stranded RNA, while RNase cleaves both single-stranded and double-stranded RNA.
RNASE A is a single-stranded RNA-specific ribonuclease, which means that it only targets single-stranded RNA molecules. It is a relatively small protein with a molecular weight of about 14 kDa, and it is found in the pancreas of many vertebrates. RNASE A is a member of the RNASE A superfamily, which includes several other ribonucleases with similar structures and functions.
RNASE, on the other hand, is a general term that can refer to any type of ribonuclease, regardless of its structure or specificity. There are many different types of RNASEs, including RNASE A, RNASE H, RNASE III, and RNASE P. Each of these RNASEs has a different structure and targets different types of RNA molecules.
In summary, the main difference between RNASE A and RNASE is that RNASE A is a specific type of ribonuclease that targets single-stranded RNA molecules, while RNASE is a general term that can refer to any type of ribonuclease.
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where do scavengers in an ecosystem obtain their energy from?
Answers
Scavengers and decomposers get their energy by eating dead plants or animals.
Decomposers are organisms that break down dead or decaying organic matter into simpler compounds. They are an essential part of the ecosystem, as they play a critical role in the nutrient cycling process by releasing essential nutrients back into the environment.
Decomposers include various bacteria, fungi, and some species of insects and invertebrates. They secrete enzymes that break down complex organic molecules, such as proteins, carbohydrates, and lipids, into smaller molecules that they can absorb and use for energy and growth. In the process, they release carbon dioxide, water, and other substances into the environment. Without decomposers, dead organic matter would accumulate, and nutrients would become locked up, making them unavailable to other organisms.
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When summarizing the process of transcription in a cell as a gene is used to build a polypeptide, which of these statements
accurately reflects the process of transcription? You may choose all that apply.
les)
A)
An mRNA molecule is produced in the nucleus of the cell.
B)
The ribosome attaches to the DNA to build a polypeptide,
The resulting RNA molecule is a complement of the gene on the DNA.
D)
The RNA molecules contains three nucleotides in a row whose bases form
a codon.
E)
A polypeptide is synthesized based on the sequence of nucleotides on the
tRNA molecule.
Answers
Answer:A. An mRNA molecule is produced in the nucleus. C. The resulting RNA molecule is a complement of the gene on the DNA. D. The RNA molecules contains three nucleotides in a row whose bases form a codon.
Explanation: tRNA and ribosomes aren’t used in protein synthesis until translation. The tRNA molecule sequence is not used in either transcription and translation
The statement that reflects the process of transcription is
An mRNA molecule.The resulting RNA molecule.It contained three nucleotides. What is the process of transcription:It does include:
An mRNA molecule is produced in the nucleus of the cell.The resulting RNA molecule is a complement of the gene on the DNA.The RNA molecules contains three nucleotides in a row whose bases form.Hence, A, C and D are correct.
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18. Does the blood of the mother and the baby ever mix?
Answers
Answer: No
Explanation: Usually a mother and baby's blood do not mix while the baby is in the womb. The mother's blood runs alongside the placenta, and the nutrients needed by the baby are absorbed and transferred to him/her.
Answer:
yes it does
Explanation:
because the mother is one half of the whole required to make a child
Can you please help me
Answers
Answer:
Rights: bedbug removal, purchase agreement
Responsibilities: major repairs, rental walkthrough
Cell Junctions help in moving up a level in the hierarchy of organization of living systems. When cell junctions from, the system goes from the cell level to the _________ level.
Answers
Cell Junctions help in moving up a level in the hierarchy of organization of living systems. When cell junctions from, the system goes from the cell level to the _tissue_ level.
an inherited, progressive disorder of the muscles that affect movement and function is called
Answers
The inherited, progressive disorder of the muscles that affect movement and function is called muscular dystrophy.
A muscular dystrophy is a group of genetic disorders characterized by progressive weakness and degeneration of the skeletal muscles that control movement. It is a progressive disorder that results in muscle weakness and decreased muscle mass. It also causes issues with the heart and breathing muscles as it progresses. Muscular dystrophy is caused by a lack of a protein called dystrophin that helps maintain muscle integrity. In some cases, this lack of dystrophin is inherited, but in other cases, it is caused by a spontaneous genetic mutation. There are several types of muscular dystrophy, with Duchenne muscular dystrophy being the most common and severe form. Other types include Becker muscular dystrophy, limb-girdle muscular dystrophy, and myotonic dystrophy. Treatment for muscular dystrophy varies depending on the type and severity of the disorder.
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The range of beak depths for the non-surviving birds was between 7.25 mm and 11.25 mm, and more than half of the non-surviving birds had beak depths between 8.5 mm and 9.5 mm. The most common beak depths for the non-surviving birds were 8.5 mm and 9 mm.
Answers
Beak depth and range of beak depths: The beak depth refers to the thickness of the beak from the top to the bottom. For example, in a bird, the beak depth could be measured as the thickness of the beak from the top of the upper beak to the bottom of the lower beak.
The range of beak depths for the non-surviving birds was between 7.25 mm and 11.25 mm. Half of the non-surviving birds had beak depths between 8.5 mm and 9.5 mm.The beak depth is an important characteristic in birds as it helps them to obtain food. Birds with thicker beaks can crush harder seeds and nuts, while birds with thinner beaks can handle softer food. The most common beak depths for the non-surviving birds were 8.5 mm and 9 mm.
Beak depth is an important characteristic in birds and can be influenced by various factors such as genetics, diet, and environmental conditions. The mentioned measurements indicate the range and distribution of beak depths among the birds that did not survive, suggesting that there may be a correlation between beak depth and survival in this particular population.
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What does the distribution of beak depths reveal about the survival rates of birds in the study?
You want to study the relationship between daily alcohol consumption and prostate-specific antigen levels. It was suggested that these two parameters have a linear relationship and as you increase your alcohol consumption your prostate-specific antigen level increases. What kind of a linear model would represent this relationship?
Answers
The kind of linear model that would represent this relationship is a positive linear model.
In a positive linear model, as the independent variable (alcohol consumption) increases, the dependent variable (prostate-specific antigen levels) also increases in a linear fashion. This implies that there is a positive correlation between the two variables, suggesting that higher alcohol consumption is associated with higher levels of prostate-specific antigen.
A linear model represents a straight-line relationship between the variables, and in this case, it would show a positive slope. The slope of the line indicates the rate at which the prostate-specific antigen levels increase with each unit increase in alcohol consumption.
By studying this relationship, researchers can gain insights into the impact of alcohol consumption on prostate-specific antigen levels and potentially understand the association between alcohol and prostate health.
However, it is important to note that further research and analysis are necessary to establish a causal relationship and consider other factors that may influence prostate-specific antigen levels.
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Why is the control group important?
Answers
Answer:
You would compare the results from the experimental group with the results of the control group to see what happens when you change the variable you want to examine. A control group is an essential part of an experiment because it allows you to eliminate and isolate these variables.
Explanation:
*Hope this helps*
which type of incontinence refers to involuntary loss of urine through an intact urethra as a result of a sudden increase in intra-abdominal pressure? overflow urge reflex stress
Answers
Urinary incontinence can take the form of stress incontinence, sometimes referred to as stress urinary incontinence (SUI) or effort incontinence.
It is caused by the urethral sphincter's insufficient closure of the bladder outlet. When pressure is applied to the bladder, such as during exercise, coughing, sneezing, laughing, or lifting heavy things, stress incontinence develops when pee leaks. In younger and middle-aged women, it is the most typical form of bladder control issue. When performing physical actions that raise intra-abdominal pressure, such as coughing, sneezing, laughing, or other physical activity, it is characterised by the involuntary leakage of urine. Urinary incontinence can be classified into five basic categories: functional, urge, mixed and stress. Another type of incontinence brought on by a spinal cord injury is reflex incontinence.
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Unicellular organisms can reproduce, move, are simple, eats.
Which word is not true.
Answers
Answer:
So, they do eat...they do reproduce...they are simple...and can move.
So if you were lazy and skipped a type of food mentioned or anything, please ask the entire question, with all the included words. This way I can evaluate from how/the way they say it.
Will notices that crickets seem to chirp more frequently at night in June the they do in October he asks himself how do temperature changes affect how often crickets chirp if he were to perform an experiment which if theses statements would be the best hypothesis
Answers
Answer:
This question lacks options; the options are:
A) Crickets are inactive in October.
B) Do crickets like warm weather better than cold weather?
C) Crickets chirp more frequently as temperature increases.
D) Crickets chirp for many reasons, and temperature is probably one reason.
The answer is C
Explanation:
A hypothesis is a testable explanation given to an observed problem. The hypothesis aims at solving or answering a particular question or observation. A hypothesis, which is subject to testing via experimentation, explains how the independent variable affects the dependent variable.
According to this question, Will notices that crickets seem to chirp more frequently at night in June than they do in October. He then asks a scientific question based on this observation that goes thus: how do temperature changes affect how often crickets chirp?
The best hypothesis that explains this scientific question is "Crickets chirp more frequently as temperature increases" because it gives a predictive statement about how a change in temperature (independent variable) affects chirping in crickets (dependent variable).
Explain what happens to the level of the sucrose solution in the glass tube
Answers
The level of sucrose solution will rise in the glass tube because water molecules will pass through the semipermeable membrane into the tube as water potential is higher outside than inside the tube.
What is osmosis?Osmosis is the movement of water molecules from a region of low solute concentration or high water potential to a region of high solute concentration or low water potential through a semipermeable membrane until equilibrium concentration is attained.
The movement of water molecules is based on a concentration gradient, from a region where there are more water molecules to a region where there are fewer water molecules.
Thus, this could be the answer.
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What path do global winds follow due to the Coriolis effect?
Answers
Answer:
A curved path
Explanation:
Global winds follow a curved path due to the Coriolis effect.
What is Coriolis effect?This is defined as an apparent deflection of the path of an object that moves within a rotating coordinate system.
Since Coriolis effect involves rotation, then the winds will follow a curved path which makes it the most appropriate choice.
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When DNA replicates, a guanine forms a base pair with?
a) uracil
b) guanine
c) cytosine
d) adenine
e) thymine
Answers
When DNA replicates, a guanine forms a base pair with cytosine. A DNA molecule consists of two complementary strands that are paired together through the hydrogen bonding between their nitrogenous bases.
A nitrogenous base is a kind of nitrogen-containing molecule that serves as a base in nucleotides, which are the building blocks of nucleic acids like DNA and RNA.In DNA, there are four kinds of nitrogenous bases: adenine (A), thymine (T), cytosine (C), and guanine (G).
Adenine pairs with thymine and cytosine pairs with guanine to form base pairs.A T-C-G-A base pairing system works by combining a purine and a pyrimidine into a twofold structure. Adenine and guanine are purines, and thymine and cytosine are pyrimidines. Adenine always pairs with thymine, while guanine always pairs with cytosine, which is what is happening in your question. Therefore, when DNA replicates, a guanine forms a base pair with cytosine.
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c) Suggest what can be done to address any discrepancy. Start explaining the most practical solution first and then the least favorable solution(s). Write in the provided box, please. [10 marks]
Answers
Answer:
Explanation:
yes cux it is good
and i needpoints
The initial population of a bacteria colony is observed to be 500 bacteria. The population shows a growth rate of 50% per day, and the carrying capacity of the surrounding is estimated to be 2,000,000 bacteria. To the nearest whole number, find the population of bacteria after 15 days. A 165,822 bacteria B 622,707 bacteria C) 903,430 bacteria 2,000,000 bacteria
Answers
The population, to the nearest whole number, of bacteria after 15 days is approximately 4,769 bacteria, The correct option is E, None of the above.
To find the population of bacteria after 15 days, we can use the formula for exponential growth:
N = N₀ * \((1 + r)^t\)
Where: N = Final population after time t N₀ = Initial population r = Growth rate per time period t = Time period
Given: N₀ = 500 bacteria r = 50% per day (or 0.5) t = 15 days
Plugging in the values, we have:
N = 500 * \((1 + 0.5)^{15\)
Calculating this expression:
N = 500 * \((1.5)^{15\) N
= 500 * 9.537 N
= 4,768.5
Thus, the correct option is E, None of the above.
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The question is inappropriate; the correct question is:
The initial population of a bacterial colony is observed to be 500 bacteria. The population shows a growth rate of 50% per day, and the carrying capacity of the surrounding area is estimated to be 2,000,000 bacteria. To the nearest whole number, find the population of bacteria after 15 days.
A. 165,822 bacteria
B. 622,707 bacteria
C. 903,430 bacteria
D. 2,000,000 bacteria
E. None of the above
Tell me what the answer?
Answers
Socratic can help! This learning app, powered by Google AI, helps you understand your school work at a high school and university level. Ask Socratic a question and the app will find the best online resources for you to learn the concepts.
fatty folds of skin that encircle and partially conceal the labia minora and vestibule are the
Answers
The fatty folds of skin that encircle and partially conceal the labia minora and vestibule are known as the labia majora.
The labia majora are a pair of prominent, rounded folds of skin and adipose tissue that surround and protect the vulva, which is the external female genitalia. They are located on either side of the vaginal opening and extend from the mons pubis to the perineum.
The labia majora are the female homologous of the male scrotum and play a similar role in protecting the underlying genitalia. They are covered with pubic hair and contain numerous sebaceous and sweat glands, which produce lubrication to help prevent chafing and irritation.
The labia majora are highly sensitive to touch and can be a source of sexual pleasure for many women. However, they can also be subject to various health conditions, including infections, cysts, and tumors, which may require medical treatment.
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Transcutaneous electrical nerve stimulation (TENS) therapy involves the use of low-voltage electric currents to treat pain. Electrodes or mediums for electricity to travel to the body, placed on the body at the site of pain deliver electricity that travels through the nerve fibers.
The electric currents block the pain receptors from being sent from the nerves to the brain. A patient will receive a small, battery operated TENS machine to use at home. In most cases, a doctor, physical therapist, or acupuncturist adjusts the machine to the correct settings. The provider shows the patient how to use the machine before sending him or her home with the TENS device.
task: Based on the statement above, prepare a report regarding the theory of "Transcutaneous Electrical Nerve Stimulation"
Answers
Transcutaneous Electrical Nerve Stimulation (TENS) is a therapy that involves using low voltage electric currents for pain treatment. The therapy is used for reducing both chronic and acute pain.
Electrodes or mediums for electricity to travel to the body are placed on the body at the site of pain to deliver electricity that travels through the nerve fibers. The electric currents block the pain receptors from being sent from the nerves to the brain.TENS works on the theory of gate control pain theory, which states that the spinal cord acts like a gate, and the transmission of pain signals to the brain can be controlled by opening or closing this gate. Stimulation of the A-beta nerve fibers, which are bigger than the pain-carrying nerve fibers, closes the gate, leading to a decrease in pain.A TENS machine is small and battery-operated, and it can be used by patients at home. In most cases, a doctor, physical therapist, or acupuncturist adjusts the machine to the correct settings. The provider shows the patient how to use the machine before sending him or her home with the TENS device. TENS therapy is often used for the treatment of various types of pain such as neuropathic pain, post-operative pain, and musculoskeletal pain.
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During exercise, when muscle cells runs out of oxygen, _________builds up in muscles, causing a painful burning sensation
Answers
Answer:
Lactic Acid
Explanation:
In humans, a process called fermentation occurs (when a cell does not have access to oxygen) to produce ATP. A byproduct of this is lactic acid (caused by the deposition of electrons from NADH into Pyruvate.
Read the sentence. Fill in the blank with the correct answer. Type answer in all lower-case letters.
3. The distance between the Earth and the sun is about 93 million miles. To reduce the difficulties
of dealing with the large numbers of these distances scientists have designated the distance
from the Earth to the sun as one (blank) or AU
Answers
Answer:
One astronomical unit is the approximate mean distance between the Earth and sun. It's about 93 million miles (150 million km), or 8 light-minutes. Enjoying ...
Explanation:
Image result for he distance between the Earth and the sun is about 93 million miles. To reduce the difficulties of dealing with the large numbers of these distances scientists have designated the distance from the Earth to the sun as one (blank) or AU aphelion Half a year after perihelion, Earth reaches its farthest distance from the star, which is called aphelion. At that moment, the planet is approximately 94.5 million miles (152.1 million km) from the sun. Aphelion occurs in early July. Perihelion and aphelion average out to about 93 million miles (150 million km).
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CASE STUDY 2
A 40-year-old male presents at the Urgent Care Clinic after being hit in the face with a baseball. The patient complains of double vision and pain in his face. Upon physical exam, you observe that the left eye is fixed in downward gaze, but the right eye moves normally. The patient’s right cheek is also very tender. You order a CT scan to determine the extent of his facial injuries. A coronal image through the orbits and sinuses is displayed.
Questions:
1. What orbital bone is fractured and what sinus is involved in this injury?
2. How could this fracture affect movement of the eye?
Answers
1. Fracture: Orbital floor of left eye. Sinus: Maxillary sinus.
2. Fracture affects eye movement by entrapment of inferior rectus muscle or nerve, limiting upward gaze and causing double vision.
1. Based on the provided information, it is likely that the patient has a fracture of the orbital floor, specifically the orbital floor of the left eye. The involvement of the left eye being fixed in downward gaze suggests a possible entrapment of the inferior rectus muscle or the inferior orbital nerve, which commonly occurs with orbital floor fractures. Additionally, the tenderness in the right cheek may indicate a possible blowout fracture, which involves the maxillary sinus.
2. The fracture of the orbital floor can affect the movement of the eye due to several reasons. Firstly, the entrapment of the inferior rectus muscle or the inferior orbital nerve can limit the normal upward movement of the affected eye, resulting in a fixed downward gaze as observed in the patient. This restriction can lead to double vision (also known as diplopia) when the eyes are not properly aligned.
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match each of the following descriptions to the correct term. group of answer choices the information in dna is copied into mrna [ choose ] the information in the mrna is used to build a protein [ choose ] contains the information for the amino acid sequence of the protein [ choose ] a part of the ribosomes, which builds the protein [ choose ] matches the correct codon with the correct amino acid [ choose ] three nucleotides in the mrna than encodes for one amino acid [ choose ] three nucletoides on the trna that base pair with the codon [ choose ]
Answers
mRNA copies the information from DNA: Transcription. the answer is Transcription.
Building a protein begins with the information in the mRNA: Translation. The answer is Translation.
contains information about the protein's amino acid composition: mRNA. The answer is mRNA.
a section of the ribosomes responsible for protein synthesis: rRNA, or ribosomal RNA. The answer is rRNA or ribosomal RNA.
connects the appropriate codon with the appropriate amino acid: tRNA, or transfers RNA. The answer is tRNA or transfer RNA.
The mRNA has three nucleotides that each code for one amino acid: Codon. The answer is Codon.
Three tRNA base-pairing nucleotides with the codon are Anticodon. The answer is Anticodon.
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