BIOCHEM EXAM 2025/2026 QUESTIONS WITH 100% ACCURATE ANSWERS

BIOCHEM EXAM 2025/2026 QUESTIONS WITH 100%
ACCURATE ANSWERS
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 - D) All of the above



_______________ are enzymes that catalyze the transfer of a phosphoryl group from ATP to an
acceptor

A) Phosphatases

B) Kinases

C) ATPases

D) Synthases

E) Transferases - B) Kinases



_________________ is the principle carbohydrate in living systems

A) sucrose

B) glycogen

C) lactose

D) fructose

E) glucose - E) glucose



The product of aerobic glycolysis is _____________.

A) lactate

B) gyceraldehyde

C) pyruvate

D) formate

E) alpha-ketoglutarate - C) pyruvate

, The regeneration of ______________ in the reduction of pyruvate to lactate sustains glycolysis under
anaerobic conditions.

A) NADH

B) NAD

C) FADH

D) FAD

E) FMN - B) NAD



The first irreversible enzymatic reaction unique to a metabolic pathway is called the ______________
step

A) regulated

B) high energy

C) exothermic

D) rate limiting

E) committed - E) committed



Which of the following functions as a "flexible swinging arm" when it transfers the reaction
intermediate from one active site to the next?



a) FAD

b) NAD+

c) Lipoamide

d) Thiamine pyrophosphate

e) coenzyme A - c) Lipoamide



Pyruvate dehydrogenase is _________________ when ATP-ADP ratios are high

A) activated

B) inactivated

C) phosphorylated

D) B and C

E) A and C - D) B and C