Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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identify the major reactants and products of the urea cycle.
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- Explain what happens to milk proteins during the formation of yogurt. (HInt: yogurt is made by fermentation of milk by bacteria, typically Lactobacillus bulgaricus and Streptococcus thermophillus. The bacteria convert milk sugar to lactic acid.)arrow_forwardGlutamate, produced in the first transamination reaction, reacts with oxaloacetate in the second transamination reaction to form aspartate that can directly enter the urea cycle. In an oxidative deamination reaction, the same glutamate molecule, through the action of glutamate dehydrogenase along with the presence of the coenzyme NAD+, can produce an ammonium ion which can also directly enter the urea cycle. The first statement is incorrect while the second statement is correct The first statement is correct while the second statement is incorrect Both statements are correct Both statements are incorrectarrow_forwardWhat is coenzyme A and why is it important?arrow_forward
- Where does aspartate enter the urea cycle and what compound does it eventually leave as? What metabolic cycle does this compound then enter?arrow_forwardtrue/false: N-acetyl glutamate regulates the urea cycle by increasing the transcription of the enzymes involved.arrow_forwardThe urea cycle can be summarized through the following reaction: O || H2N-C-OPO3 + COO- | H3N-CHCH₂COO b. O || H2N-C-NH2 1a Write the reactions, using structural formulas that lead to the formation of carbamoyl phosphate and its subsequent incorporation into the urea cycle. Name the enzymes and how they are activated. 1 + OOCCH=CHCOO- Write the rest of the reactions that constitute the urea cycle using structural formulas. Name the enzymes that catalyze each reaction. Indicate which reactions occur in the mitochondrion and which occur in the cytoplasm.arrow_forward
- What Are the General Features of AllostericRegulation?arrow_forwardWhat is the source of carbon in the formation of urea?arrow_forwardAll defects in the urea cycle lead to an elevated level of ammonium ion in blood, which is called: hyperammonemia. hypoammonemia. toxaemia. ammonemia. anemia.arrow_forward
- Write the rest of the reactions that constitute the urea cycle using structural formulas. Name the enzymes that catalyze each reaction. Indicate which reactions occur in the mitochondrion and which occur in the cytoplasm.arrow_forwardWhich enzyme(s) in the urea cycle mediate(s) (an) irreversible reaction(s) (select all that apply)? O arginosuccinate synthetase arginosuccinase carbamoyl phosphate synthetase I arginase O ornithine transcarbamoylasearrow_forwardLactose intolerance is caused by reduced production of the enzyme lactase. A variety of digestive system problems, such as celiac disease and Crohn’s disease) can also lower the production of lactase. If an individual produces low levels of the enzyme lactase, explain why they might be able to tolerate eating dairy products that contain lower levels of lactose (e.g., hard cheeses, feta cheese, and cottage cheese), but will not be able to tolerate foods with high levels of lactose (e.g., milk).arrow_forward
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