Exam 21: Amino Acid Metabolism

Matching Choose the correct answer from the list. Not all the answers will be used. -_____ are involved in the nonselective degradation of proteins in well nourished cells.

Which of the following statements about tryptophan synthase is FALSE?

The metabolite chorismate

Individuals with an alanine to valine mutation in N⁵, N¹⁰ - methylenetetrahydrofolate reductase (MTHFR) I.typically have higher levels of homocysteine. II.have increased risk for cardiovascular disease. III.typically have increased incidence of oxidative damage to the walls of blood vessels. IV.are at increased risk, if female, of giving birth to a child with a neural tube defect.

What are KFERQ proteins? I.Proteins that contain the KFERQ pentapeptide sequence (or a similar sequence). II.Proteins that are selectively degraded in tissues that atrophy after a prolonged fast (starvation). III.A special set of enzymes that are activated in response to starvation.

Nitrogenase I.can be found in most bacteria and a few invertebrate animals. II.contains unique redox centers that contain both Fe and Mo. III.changes in conformation as a result of ATP hydrolysis. IV.carries out a reaction that reduces nitrogen to NO.

In which cellular location listed below does the following reaction take place? arginine → urea + ornithine

Matching Choose the correct answer from the list. Not all the answers will be used. -ATP-dependent degradation of ubiquitinated proteins is mediated by ______.

Matching Choose the correct answer from the list. Not all the answers will be used. -The cofactor ______ is used to transfer C₁ units such as methyl, formyl, and methenyl groups.

The neurotransmitters, dopamine, epinephrine, and norepinephrine are synthesized from the amino acid