Mammals excrete most nitrogen atoms as urea. The urea cycle itself requires considerable amounts of ATP. What mechanism does the liver cell have to compensate for that energy input?

Q: Argininosuccinic aciduria is a condition that results when the urea-cycle enzyme argininosuccinase…

A: The urea cycle is a biochemical process that converts ammonia into urea as a waste to remove…

Q: Which amino acids are involved in the urea cycle but not the genetic code?

A: The end products of amino acid and nucleic acid metabolism meet the urea cycle. The urea cycle is…

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Q: NH4 Water+ Carbon Dioxide + ATP A F B THE UREA CYCLE D

A: Urea is synthesized in the liver and excreted through urine by the kidneys. Urea is the waste…

Q: The small intestine catabolizes amino acids, producing signifi cant amounts of NH4+. Describe the…

A: The small intestine is the major site in the body, which helps in the process of absorption. All the…

Q: The enzyme carbamoyl phosphate synthetase is activated when the glutamate concentration decreases,…

A: In our body, glutamine plays a predominant role in the body as its release in the blood is regulated…

Q: The stomach has two types of exocrine cells: the chief cells, which secrete an inactive form of the…

A: Introduction: There are two types of secretory cells in the stomach: chief cells and parietal cells.…

Q: In humans, uric acid is the final product of Allantoin metabolism, Amino acid metabolism, Purine…

A: Uric acid is a heterocyclic compound of carbon, nitrogen, oxygen, and hydrogen with the formula…

Q: Explain the function of brown fat. What does its mechanism imply about the effect of ATP…

A: Brown Fat  Adipose tissues are found under the skin that consists of two types of fats: white fat…

Q: All of the following statements about amino acid metabolism in humans are true except: The process…

A: The complex series of metabolic processes in the body that involve the synthesis and breakdown of…

Q: Little ATP is produced during initial breakdown of macromolecules that occurs in the gut.

A: ATP or the adenosine triphosphate is the chemical energy storage molecule that stores the chemical…

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A: Food chain it depicts how energy and nutrients flow through an ecosystem. Plants produce energy at…

Q: What is the overall yield or consumption of ATP for one turn of the urea cycle?     ANSWER       +…

A: The urea cycle utilizes ammonia and converts it to urea with the help of aspartate. The urea cycle…

Q: Which enzyme is found in human saliva?

A: An enzyme is a biocatalyst that speeds up the reaction. All the enzymes are protein in nature. All…

Q: What are the energy consuming steps of the urea cycle and what is the energetic cost of the urea…

A: Introduction: The cycle involves a series of biochemical reactions to produce urea from ammonia. It…

Q: (c) Describe the reversible steps in the urea cycle, including the substrates, products, and…

A: The urea cycle is also known as the Krebs-Henseleit Ornithine cycle. This can be described as a…

Q: Which of the following statements is/are TRUE for the urea cycle? It has a direct link with the TCA…

A: Urea cycle is central pathway for the production of urea. Urea production is important as NH4+…

Q: Which of the following statements concerning the urea cycle is TRUE? 1. The pathway requires ATP.…

A: The urea cycle, also referred to as the ornithine cycle, is a series of biochemical processes that…

Q: How is the urea cycle linked to the citric acid cycle? Write the net equation of the urea cycle and…

A: The urea cycle is the biochemical reaction that produces urea from the toxic substance ammonia and…

Q: NH4+ is transported indirectly in the body. Why can’t free NH4+ be transported in the blood? How is…

A: NH4+ is the waste product formed from the amino acids on their catabolism. It must be transported…

Q: In the Alanine Cycle, different organs work together to produce glucose from protein.  Which…

A: Several organs collaborate in the Alanine Cycle to create glucose from protein. We need to choose…

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Q: Ammonia enters the urea cycle as: OA) aspartate. OB) glutamate. OC) carbamoyl phosphate. D) NH4*.

A: The urea cycle is the main  metabolic pathway involved in the removal of nitrogenous waste that is…

Q: In humans the purine ring cannot be degraded. How is itexcreted? What reactions are involved?

A: Purine is a heterocyclic aromatic organic compound that consists of two rings. It is water-soluble…

Q: How is the rate of amino acid deamination linked to the rate of the urea cycle?

A: Deamination or oxidative reaction is the process occurring in all the tissues but mainly in the…

Q: Why can’t humans simply excrete waste nitrogen atoms asammonia rather than utilize the energetically…

A: Protein degradation produces ammonia. The nitrogenous waste differs in different organisms. Most of…

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A: Glucose is required necessarily by an organism because the brain is completely dependent upon…

Q: How many -amino acids participate directly in the ureacycle? Of these, how many can be used for…

A: Amino acids are biomolecules that act as the building blocks of proteins. Alpha-amino acids are the…

Q: enzymes in TCA cycle are found in gly colysis to generate energy. Why is this posible even though…

A: The first of the essential metabolic processes of cellular respiration to generate energy in the…

Q: Write out the series of reactions that are involved in the urea cycle in mammals and amphibians.…

A: The urea cycle (otherwise called the ornithine cycle) is a pattern of biochemical responses that…

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A: Porphobilinogen synthase is an enzyme also known as aminolevulinate dehydratase, which is an…

Q: Which of the following is a substrate in the urea cycle? a. fumarate b. glutamate c. aspartate d.…

A: In unreotelic organisms, harmful ammonia has to be converted into less harmful urea that is released…

Q: Predict physiological consequences of a constitutively active glucose uniporter in the intestines .

A: Uniporter is a membrane transport protein that transports a single species of substrate across a…

Q: Why is the urea cycle important?

A: A biochemical reaction that is responsible for the conversion of excess ammonia (NH3) in the body to…

Q: How does the level of glutamic acid affect the urea cycle?

A: The liver is the major site of gluconeogenesis, the major organ of amino acid catabolism and the…

Q: Make a flowchart that indicates the pivotal intermediates through which glucose can be converted to…

A: Glucose absorbed from gastrointestinal tract is directly delivered to the liver. Glucose is released…

Q: A friend bets you a bazillion dollars that you can’t prove that the urea cycle is linked to the…

A: Introduction: The urea cycle that takes place in the liver is closely linked to the citric acid…

Nitrogen metabolism

Nitrogen metabolism is the synthesis, utilization or uptake, breakdown, and excretion of nitrogenous compounds in the body. The nitrogen metabolism encompasses nitrogen fixation, biosynthesis, and the breakdown of amino acids, purines, and pyrimidine. Since nitrogen-containing compounds are required for various life processes, nitrogen is an important element of life.