Exam (elaborations) BIOCHEM CHAPTER 18

BIOCHEM CHAPTER 18 EXAM 18
Which of the following neurotransmitters is INcorrectly paired with its amino acid
derivative?

A) Catecholamines; tyrosine

B) γ-aminobutyric acid; glutamate

C) Nitric oxide; arginine

D) Melatonin; tryptophan

E) Serotonin; serin - CORRECT ANSWER-E) Serotonin; serin

The breakdown products of threonine are glycine and acetyl-CoA. This amino acid
would be classified as - CORRECT ANSWER-C) Both ketogenic and glucogenic

Which of the following participates in AMP synthesis from IMP?

A) ATP

B) GTP

C) Asp

D) A and C

E) B and C - CORRECT ANSWER-E) B and C

Production of the enzymes that catalyze the reactions of the urea cycle can increase or
decrease according to the metabolic needs of the organism. High levels of these
enzymes are associated with high-protein diets. How would the levels be affected by
starvation?

A) Levels of urea cycle enzymes would be high during starvation.

B) Levels of urea cycle enzymes would be low during starvation.

C) Starvation would not affect the levels of urea cycle enzymes. - CORRECT
ANSWER-A) Levels of urea cycle enzymes would be high during starvation.