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Exam 17: Amino Acid Metabolism

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Question 1

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is hydrolytically cleaved to directly yield urea in the urea cycle.

A) Ornithine
B) Glutamate
C) Arginine
D) Carbamoyl phosphate

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Question 2

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The changes that occur in cells that lead to its death are called .

A) cellular necroptosis
B) programmed lysis
C) apoptosis
D) morpholytic degradation

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Question 3

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Only growing and reproducing cells require a continuous supply of amino acids for the synthesis of new protein molecules.

Most green plants contain both nitrate reductase and nitrite reductase to reduce nitrogen oxides to ammonia.

Ammonia is incorporated into amino acids via which of the following?

A large percentage of nitrogen, undergoing metabolism, comes from nitrogen fixation.

Phenylalanine hydroxylase requires molecular and tetrahydrobiopterin.

Chorismate is a key branch-point intermediate in aromatic amino acid synthesis.

Nitric oxide is a very reactive compound. In vivo it reacts with oxygen and water to form nitrates and nitrites within seconds.

How many ATP are consumed in the conversion of bicarbonate to carbamoyl phosphate?

Because they lack aspartate kinase and aspartate semialdehyde dehydrogenase, cannot synthesize lysine, methionine or threonine.

Which type of protein might have a very short half-life and be specifically targeted for degradation?

During the catabolism of amino acids, the carbon skeleton is first degraded, followed by the removal of the amino group.

Which type of organisms can eliminate excess nitrogen by the direct excretion of ammonia?

Nitrogen fixation may occur via all of the following bacteria, except

Which is not part of the synthesis reactions for histidine?

All 20 common amino acids are metabolized through the citric acid cycle by first being converted to either pyruvate or acetyl CoA.

In mammals, most amino acids undergo deamination in the .

Oxaloacetate is the amino-group acceptor in the synthesis of aspartate.

If an amino acid is glucogenic, it will not be degraded to .