Exam (elaborations) BIOCHEM CHAPTER 16

BIOCHEM CHAPTER 16 EXAM 16
What is the purpose of phosphorylating glucose in cytosol?
A) to trap glucose in the cell
B) to destabilize glucose and facilitate the next series of metabolic steps
C) to convert it to a more soluble form
D) All of the above.
E) A and B - CORRECT ANSWER-E

What is the function of glyceraldehyde 3-phosphate dehydrogenase?
A) NADH production
B) oxidation of the alcohol to an aldehyde
C) dehydration and dephosphorylation of GAP
D) hydrolysis of GAP
E) None of the above. - CORRECT ANSWER-A

What is substrate-level phosphorylation?
A) phosphorylation of AMP by ATP
B) ATP synthesis when the phosphate donor is a substrate with high-phosphoryl-
transfer potential
C) phosphorylation of glycolytic intermediates
D) phosphorylation of ATP coupled to an ion gradient
E) ATP and AMP synthesis from two molecules of ADP - CORRECT ANSWER-B

What are the primary metabolic fates of pyruvate?
A) ethanol
B) lactate
C) acetyl CoA
D) All of the above.
E) None of the above. - CORRECT ANSWER-D

Lactose intolerance is caused by a deficiency of:
A) lactase.
B) elastase
C) lactose.
D) sucrase.
E) None of the above. - CORRECT ANSWER-A

How are the glycolytic enzymes regulated?
A) through transcriptional control
B) through reversible phosphorylation
C) through allosteric control
D) All of the above.
E) None of the above. - CORRECT ANSWER-D