The enzyme that works to add DNA to the ends of chromosomes in rapidly dividing cells such as those found in an embryo, to prevent genes from being lost during replication is telomerase.
Telomerase is an enzyme that can elongate telomeres by adding the telomere repeat sequence to the ends of chromosomes. It is particularly active in rapidly dividing cells such as those found in embryos or cancer cells, where it helps to prevent the loss of genetic information during cell division. Telomeres are the protective ends of linear chromosomes that act as a buffer against gene loss during DNA replication.
They are composed of repetitive DNA sequences and specialized proteins that maintain the structural integrity of the chromosome ends. In summary, telomerase is the enzyme that works to add DNA to the ends of chromosomes in rapidly dividing cells such as those found in an embryo, to prevent genes from being lost during replication.
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1. ) The cell is normally more ___ on the inside and more _____ on the outside. This voltage difference is maintained by the ___. 2. )If enough ions move to exceed the ___, an ___ can be generated that causes a change in the membrane potential big enough to conduct a signal.
The cell is normally more negative on the inside and more positive on the outside. This voltage difference is maintained by the cell membrane.
If enough ions move to exceed the threshold, an action potential can be generated that causes a change in the membrane potential big enough to conduct a signal.
The statement refers to the resting membrane potential of a cell. The inside of the cell is negatively charged relative to the outside due to an uneven distribution of ions across the cell membrane. This voltage difference is maintained by various ion pumps and channels present in the cell membrane.
When a stimulus is strong enough to depolarize the cell membrane beyond the threshold level, an action potential is triggered. This depolarization involves a rapid influx of positively charged ions, such as sodium (Na+) ions, into the cell. The action potential propagates along the cell membrane, allowing the transmission of signals in neurons and other excitable cells.
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What type of scientist would be the best qualified to perform genetic engineering to pro- duce seed that are more productive in agriculture? A. biochemist B. geologist C. molecular biologist D. paleontologist
The type of scientist best qualified to perform genetic engineering to produce more productive seeds in agriculture would be a molecular biologist, the correct option is C.
Molecular biologists specialize in studying the structure, function, and interactions of molecules within biological systems, including DNA and genes. Genetic engineering involves manipulating the genetic material of organisms, which requires a deep understanding of molecular biology principles.
Molecular biologists have the expertise to identify and isolate specific genes responsible for desired traits in crop plants, such as increased productivity or resistance to pests or diseases. They can then modify or introduce these genes into target plants to achieve the desired outcomes, the correct option is C.
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3
An elephant and a sea star are examples of...
Oinvasive species
O symbiotic species
Okeystone species
O native species
Answer:
Okeystone species
Explanation:
1. Animal cells have all of the following except:
Answer:
chloroplasts And Cell Wall
Explanation:
Animal cells each have a centrosome and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, whereas animal cells do not.
Answer:
I assume this is your question since I have seen this before.
Animal cells have all of the following except ________.
A. mitochondria
B. chloroplasts
C. a nucleus
D. Golgi apparatus
Answer: B
Explanation:
There are no choices to answer your following question, Please edit your question with a picture of answer choices or type it out properly next time. That will be greatly appreciated.
When a flower is in bud it is protected from _____.
Which cranial nerves do not have somatic motor fibers that control the extraocular muscles? check all that apply!
The cranial nerves that do not have somatic motor fibers that control the extraocular muscles are the **olfactory nerve (I), optic nerve (II), and trochlear nerve (IV)**.
The extraocular muscles are the muscles that control the movement of the eyes. They are innervated by three cranial nerves: the oculomotor nerve (III), the trochlear nerve (IV), and the abducens nerve (VI).
The olfactory nerve (I) is responsible for the sense of smell. It does not have any motor fibers.
The optic nerve (II) is responsible for vision. It does not have any motor fibers.
The trochlear nerve (IV) innervates the superior oblique muscle, which is responsible for abducting the eye downward and inward.
The abducens nerve (VI) innervates the lateral rectus muscle, which is responsible for abducting the eye outward.
Therefore, the cranial nerves that do not have somatic motor fibers that control the extraocular muscles are the olfactory nerve (I), optic nerve (II), and trochlear nerve (IV).
* The oculomotor nerve (III) is the most important cranial nerve for eye movement. It innervates all of the extraocular muscles except for the superior oblique muscle.
* The trochlear nerve (IV) is the smallest cranial nerve. It innervates the superior oblique muscle.
* The abducens nerve (VI) is the only cranial nerve that innervates a single extraocular muscle. It innervates the lateral rectus muscle.
The cranial nerves that control the extraocular muscles are essential for vision. They allow us to move our eyes in a coordinated way, so that we can see objects in our environment.
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When testing the effect of penicillin on the growth of E. coli, penicillin would be considered the? A.independent variable B. dependent variable C. constant
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
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
the body will signal thirst before dehydration occurs to prevent problems with fluid loss.
a. true b. false
The statement is false. The body's sensation of thirst is not triggered before dehydration occurs; rather, it is a response to an existing state of dehydration.
Thirst is the body's way of signaling a need for fluid intake when there is an imbalance in the body's water levels.
When the body is experiencing dehydration, such as through excessive sweating, inadequate fluid intake, or other factors that disrupt the body's fluid balance, a series of physiological changes occur. These changes include increased concentration of solutes in the blood and a decrease in blood volume. These changes are detected by specialized cells in the hypothalamus of the brain, which then trigger the sensation of thirst.
Thirst serves as a mechanism to encourage an individual to drink fluids and restore the body's fluid balance. By responding to the sensation of thirst and consuming fluids, individuals can help prevent further dehydration and maintain proper hydration levels.
Therefore, the body signals thirst in response to dehydration, rather than before it occurs.
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how do weedkillers work?
Answer:
the have a special chemical in them causing the plant to descintagrate over time from the special chemical :)
Explanation:
how do weedkillers work?
Answer:→ It works by stimulating growth in the weed that cannot be sustained.What is Weedkillers?→Weedkillers are chemical-based liquids that are specifically engineered to target different types of weed in the best way possible. Whatever the weeding job that you are trying to tackle, there is a weedkiller that is matched to that job and will do exactly what you need.
Hopefully Help:)
#CarryOnLearningDuring a lion and cub moment, Mufasa says to Simba, “Everything you see exists together in a delicate balance…..respect all creatures”. How can this quote be related to the concept of the food web, pyramid of energy, and/or the pyramid of numbers? What could happen if this balance is not respected? Indicate a scene in the movie that is an example of this loss of balance.
Answer:
The quote refrences to the fragility of our enviorment and how that balance is to not be disrupted. That no matter how small,every detail affects that balance and is not to be tampered with. It is the same in the food chain,the elimination of even the smallest of species can have devastating effects on an ecosystem. That is why it is important to preserve resources and respect all life. an example of that balance being disrespected in the movie would be the scene where the once beautiful valley was barren and dry due to the hyenas destroying and using up all of the resources, thus destroying the balance of life and bringing famine to their lands.
Explanation: The circle of life man
When a balance is not respected then it leads to destruction of the whole ecosystem not a single organism.
What is the relation of the quote?This quote is related to the concept of the food web, pyramid of energy, and the pyramid of numbers because every organism is dependent on other organism for its survival. If that organism is eliminated from the ecosystem, then the organism that feeds on it also die.
If this balance is not respected and maintained then the whole ecosystem is destroyed because every organism is dependent on othe organism.
So we can conclude that when a balance is not respected then it leads to destruction of the whole ecosystem not a single organism.
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explain why the structure of DNA is described as a double helix
Answer:
The double helix is the description of the structure of a DNA molecule. A DNA molecule consists of two strands that wind around each other like a spiral staircase. Each chain has a backbone in which a sugar (deoxyribose) and a phosphate group alternate.
assume you have an osmotic cell (solution on one side of the semi-permeable membrane, pure solvent on the other) at equilibrium. what will happen to the liquid levels if the temperature is increased?
An osmotic cell in equilibrium, consisting of a solution on one side of a semi-permeable membrane and pure solvent on the other, is a delicate balance waiting to be disrupted.
A change in temperature can cause a perplexing and dramatic shift in the liquid levels on both sides of the membrane.
If the solute in the solution is a non-volatile substance, such as salt or sugar, increasing the temperature will result in a burst of increased kinetic energy among the solvent molecules.
This results in a dramatic increase in the rate of osmosis, with the solvent rushing from the pure solvent side to the solution side, leading to a noticeable increase in the liquid level on the solution side and a drop on the pure solvent side.
But if the solute is a volatile substance, such as alcohol, the story is different. The increase in temperature causes the vapor pressure of the solute to surge, leading it to rapidly move from the solution side to the pure solvent side.
This results in a perplexing decrease in the liquid level on the solution side, with a corresponding increase on the pure solvent side.
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The endosymbiotic theory of eukaryote evolution states that organelles in eukaryotic cells are derived from prokaryotes. Which statement is the strongest evidence in support of the endosymbiotic theory?
A Eukaryotic organelles are similar in size and shape to prokaryotes.
B Eukaryotic organelles can reproduce though sexual reproduction.
C Eukaryotic organelles stop functioning outside of a plant cell.
D Eukaryotic organelles contain DNA similar to prokaryotic DNA.
Answer:
C. Eukaryotic organelles stop functioning outside of a plant cell.
Explanation:
Because Certain functions are carried out within different structures of the cell. These structures ... Organelles in Eukaryotic Cells. 5. Model 3 – Animal Cell vs. Plant Cell. Plant cells have a cell wall, a large central vacuole, chloroplasts, and other specialized ... Chloroplasts are the organelles that carry out photosynthesis. ... Despite differences in structure and function, all living cells in multicellular organisms .It is these cells, tissues, and organs that carry out the dramatic lives of plants. Plant Cells. Plant cells resemble other eukaryotic cells in many ways. ... are enclosed by a plasma membrane and have a nucleus and other membrane-bound organelles. ... The different types of plant cells have different structures and functions. Hope this helps you!
Passage 1: Two or more individuals trying to use the same resource, such as food, water, shelter, space, or sunlight, is called competition. Because resources are in limited supply in the environment, the use of them by one individual or population decreases the amount available to other organisms. Competition also occurs between individuals within a population. The elk in Yellowstone National Park are herbivores that compete with each other for the same food plants in the park. According to passage 1, competition occurs between which of the following?
Answer:
between individuals
Explanation:
Given in paragraph
If a spectrophotometer sample was prepared with pigment dissolved in petroleum ether, what should the blank contain? petroleum ether water pigment only pigment and petroleum ether
If a spectrophotometer sample was prepared with pigment dissolved in petroleum ether, the blank should contain only petroleum ether. option (1)
What is a spectrophotometer?A spectrophotometer is a device that measures the intensity of light as a function of wavelength. The sample is illuminated with a single beam of light in the visible or ultraviolet portion of the spectrum in spectrophotometry. The transmitted light intensity or absorbance is measured using a photometer as the light beam passes through a transparent liquid sample. The most important components of the spectrophotometer are a light source, a filter or monochromator, a sample holder or cuvette, and a detector.
What is a blank solution?A blank solution is a solution that contains everything except the substance being examined. The blank solution is used as a reference solution. The reference solution is the one against which other test samples are measured or compared. It is frequently a substance of identical composition to the sample being examined, except that it does not contain the substance being tested or subjected to a change. This approach makes it feasible to determine only the effects of the variable of interest. For instance, in spectrophotometry, a blank is a sample of the solvent that is utilized to dissolve the analyte before measurement. It is a solvent without the target analyte.
Therefore, the difference between the absorption values obtained for the sample and the blank are due only to the pigment dissolved in petroleum ether.
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Full Question: If a spectrophotometer sample was prepared with pigment dissolved in petroleum ether, what should the blank contain?
petroleum ether water pigment only pigment and petroleum etherDiscuss both challenges and opportunities that are presented by big data in cultural tourism, critically analyze your case in class on how big data has created value in tourism, and in your group identify the most effective approach in big data that can guide marketing strategies in enhancing the tourism experience among travellers. There are 3 different parts. Be specific.
Answer:
1. Challenges and Opportunities of Big Data in Cultural Tourism
Challenges:
a. Data Privacy and Security: With the vast amount of data generated, maintaining data privacy and security is a significant challenge. There are legal and ethical implications associated with the handling and use of big data, particularly concerning personal information.
b. Data Quality: The utility of big data is dependent on the quality of data collected. Inaccurate, outdated, or biased data can lead to misleading insights, which can adversely impact decision-making in tourism development and management.
c. Skills Gap: The analysis of big data requires specialized skills and knowledge. There is a challenge in finding and training staff with the expertise needed to interpret and use big data effectively.
Opportunities:
a. Personalization: Big data enables the delivery of personalized experiences to tourists by understanding their preferences, behaviors, and patterns. This personalization can improve visitor satisfaction and loyalty.
b. Decision-Making: Big data can provide valuable insights for decision-making in tourism development and management. For instance, it can help in understanding tourist flow patterns, identifying popular tourist attractions, and forecasting future trends.
c. Marketing and Promotion: Big data can guide the development of targeted marketing and promotion strategies. It can help identify potential tourist markets, assess the effectiveness of marketing campaigns, and optimize marketing strategies.
2. Case Analysis: Big Data in Tourism
Consider the case of how Airbnb uses big data. Airbnb collects large amounts of data from its users, including their travel preferences, booking habits, and feedback. By analyzing this data, Airbnb can personalize its services, recommend accommodations, and optimize pricing. Additionally, Airbnb can identify travel trends and provide valuable insights to its hosts, helping them improve their offerings. This data-driven approach has been instrumental in Airbnb's growth and success.
3. Effective Approach for Enhancing Tourism Experience
One effective approach could be the use of big data in predictive analytics. Predictive analytics involves using historical data to predict future trends. For example, by analyzing data on tourist visitation patterns, attractions can predict peak times and plan accordingly. This can help in optimizing resource allocation, improving visitor management, and enhancing the overall tourist experience.
In terms of marketing, predictive analytics can help identify potential tourists and tailor marketing messages to them. It can also help in assessing the effectiveness of marketing campaigns and making necessary adjustments. This data-driven approach can enhance marketing strategies and ultimately improve the tourism experience.
Explanation:
Which of the following farming activities is MOST helpful to the environment?
A) rotating crops to reduce soil loss
B) clearing land to grow more crops
C) damming a river to provide water for crops ,
D) spraying crops with pesticides
Answer:
A) rotating crops to reduce soil loss
Explain how the composition of blood changes as blood flows through the respiratory system Please identify TWO organs that interact and explain how the chemical composition of blood changes as a result. . 20 points!!!
Our total body weight accounts for about 7 to 8 % of blood. Blood is a mixture of around 55 percent plasma and 45 percent blood cells. Blood running through the veins, arteries and capillaries is called whole blood.
How does the blood change as it flows through the respiratory system?
Blood circulatory system, also called the cardiovascular system, delivers oxygen and nutrients to all the cells of the body.
The respiratory system consists of the respiratory passage and respiratory organ, that is the lungs.
Blood is carried to the lungs through the pulmonary arteries where it picks up oxygen. The blood then leaves the lungs and returns to the heart via the pulmonary vein. It then enters the left atrium. The blood then drops into the left ventricle through the mitral valve.
Transport of gases also occurs through blood.
For exchange or oxygenation, the deoxygenated blood is transported to the lungs from heart. Carbon dioxide is exchanged with oxygen as the blood flows through the respiratory system. For further circulation to various body parts, oxygenated blood is then transported to the heart.
Some amount of gases get dissolved in the blood plasma and get transported, whereas some amount of them is transported in the bound state.
So therefore, CO2 and oxygen bind with hemoglobin in RBC.
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Folds in the membrane of an organelle provide tremendous amount of ______ for cellular reactions without significantly increasing the volume of the organelle.
Answer:
Folds in the membrane of an organelle provide a tremendous amount of surface area for cellular reactions without significantly increasing the volume of the organelle.
the great diversity observed among living things is the result of
The great diversity observed among living things is the result of evolution, which is the process by which species change over time in response to changes in their environment.
Evolution is driven by several mechanisms, including natural selection, genetic drift, mutation, gene flow, and non-random mating. These mechanisms can cause genetic variation within populations, which can then be acted upon by natural selection or other forces to produce new species or changes in the characteristics of existing species. Over millions of years, this process has led to the incredible diversity of life we see on Earth today, from bacteria to humans and everything in between. The study of evolution and its mechanisms is a fundamental part of biology and helps us understand the history and diversity of life on our planet.
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Which has been observed in the study of embryology?
Species whose embryos have similar traits rarely have a common ancestor.
Species whose embryos have similar traits always have similar body forms as adults.
All traits present in early embryos remain throughout development.
Some traits in certain embryos disappear as the embryo develops.
Answer:
(D)
Explanation:
edge 2021
Some traits in certain embryos disappear as the embryo develops has been observed in the study of embryology.
What is Embryology?The study of how an embryo and fetus form and develop is known as embryology.
The basis of embryology prior to the widespread use of the microscope and the development of cellular biology in the 19th century was descriptive and comparative investigations.
Since the time of the Greek philosopher Aristotle, people have argued about whether the embryo is an undifferentiated entity that gradually becomes specialized or a preformed, small individual.
The study of embryogenesis, or the growth of the embryo from a fertilized egg cell, is the focus of the field of embryology. The study of embryology has aided in the understanding of congenital disorders and the development of assisted reproductive technologies.
Therefore, Some traits in certain embryos disappear as the embryo develops has been observed in the study of embryology.
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If you placed the celery into a bottle of colored water that was 35% sugar, would the colored water be seen in the celery? Why or why not? (HINT: Drawing a diagram of this scenario may help – 35% sugar is a very concentrated solution…)
1. which of the following statement describe how the prokaryotic cells appear compared to the eukaryotic cells? A. the prokaryotic cells have cell membrane will the aquatic cells do not. B. the prokaryotic cells have a nucleus while the aquatic cells do not. C.the prokaryotic cells are much smaller than the aquatic cells D. the prokaryotic cells have cytoplasm and ecori attic cells do not.
2. Does a prokaryotic cell have a cell wall?
The prokaryotic cells appear much smaller than the aquatic cells when compared to the eukaryotic cells.
Prokaryotes are one of the oldest groups of living organisms on the planet, with fossil records dating back nearly 3.5 billion years. Prokaryotic cells are those that lack a true nucleus or membrane-bound organelles. These are microbes with one cell. Bacteria and Archaea are examples of prokaryotes, while cyanobacteria are examples of photosynthetic prokaryotes.
Eukaryotes are larger and more complex than prokaryotes. Except for Kingdom Monera, they include almost all of the major kingdoms.
Eukaryotes have a cell wall, which supports and protects the plasma membrane. The plasma membrane surrounds the cell and regulates the entry and exit of various substances.
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infer whether species diversity increases or decreases after a fire on a grassland
Explain your response.
Answer:
Decreases.
Explanation:
Biodiversity may be defined as the variety of the living organism found in the earth. The diversity of the species may get affected and do not have any constant number.
The natural or human made calamity can decrease the species diversity. The fire on a grassland causes the death of many species, have harmful effects on many species and reduces the species number as well. This decreases the species diversity of the grassland.
Thus, the answer is decreases.
explain phototaxis!!!
Answear:
Phototaxis is a kind of taxis, or locomotory movement, that occurs when a whole organism moves towards or away from a stimulus of light. This is advantageous for phototrophic organisms as they can orient themselves most efficiently to receive light for photosynthesis.
Explanation:
photo means light from the sun, flashlight (etc.) and taxis mean you have to pay something to someone ex: i have to pay my bills on 3/24/2030.
PLZ ANSWER ASAP I NEED HELP will mark brainliest >_
Peter is complaining of stomach pain and constant hunger. Peter’s doctor diagnoses him with a worm infection. Peter feels hungry because the worm is absorbing food from his intestines.
Peter most likely has an infection from a(n)
tapeworm.
leech.
planarian.
marine worm.
Answer:
A) Tapeworm
Explanation:
got it right on edge nuity
Peter is complaining of stomach pain and constant hunger as he was diagnosed with a worm infection.
Peter feels hungry because the tapeworm is absorbing food from his intestine as tapeworm begins to feed off your body's nutrients to grow once it invades the body.How tapeworm infection occurs?Tapeworm infection is caused by ingesting food or water contaminated with tapeworm eggs or larvae.When tapeworm hatches and attaches itself to your intestine, it starts feeding off body's nutrients causing increase in apatite (hunger increases).It grows by reproducing proglottids ( chain looking body part) and the cycle continues.Planaria upon causing infection feeds on blood cells hence can not cause apatite.Leech and marine worm can not invade the body like tapeworm and planaria.To learn more about tapeworm infections:
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What is the advantage of the branching design of the bronchioles on our lungs into 700 million alveoli?
Answer:
More surface area for oxygen to be absorbed into the blood
Explanation:
Please help asap
1. How do radiation, conduction, and convection affect the atmosphere?
2. How does greenhouse effect warm the earth?
Answer:
1. radiation, conduction and convention all play a roll in moving heat between earth's surface and atmosphere because since air is a poor conductor, most energy transfers by conduction occuring right near the earth's surface. Conduction directly affects air temperature only a few centimeters into the atmosphere. convection works to heat the troposphere. Durring the day, the sun's radiation heats the earth's surface. the land becomes warmer than the air. Air near the Earth's surface is essentially warmed by both radiation and conduction.
What is the proper statement that describes how thyroxine and/or TRH levels are maintained? a. TSH inhibits the secretion of thyroxine from the thyroid gland. b. TSH-releasing hormone (TRH) inhibits the secretion of thyroxine by the thyroid gland. c. Thyroxine stimulates the pituitary to secrete thyroid-stimulating hormone (TSH). d. Thyroxine and TSH inhibit the secretion of TSH-releasing hormone (TRH)
The proper statement that describes how thyroxine and/or TRH levels are maintained is: D. Thyroxine and TSH inhibit the secretion of TSH-releasing hormone (TRH).
In general , the hypothalamus is responsible for the production of TRH, which is produced by the help of anterior pituitary gland that also mediate the secretion of TSH. When the TSH is secreted it will work on the thyroid gland and assists production of thyroxine (T4) and triiodothyronine (T3).
On the other hand the negative feed back loop gets activated when the levels of T4 and T3 is increased in the blood , they inhibit the secretion of TRH and TSH . This negative feed back loop is important in the proper maintenance of levels of T4 and T3 in the blood.
Hence, D is the correct option
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