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Biochemistry ACS Exam Review: Questions & Complete Answers (Rated A+)
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Biochemistry ACS Exam Review: Questions & Complete Answers (Rated A+)
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Biochemistry ACS Exam Review: Questions & CompleteAnswers (Rated A+)
As glucose levels in the blood begin to drop, glucagon is released from the
alpha cells of the pancreas. Release of this polypeptide hormone helps
increase the availability of ATP-producing compound by
A. inhibiting acetyl-Coa carboxylase causing an increased in beta-oxidation
B. stimulating glycogen phophorylase causing the release of glucose from
glycogen
C. stimulating hormone-sensitive triacylglycerol lipase in adipose cells causing
the release of fatty acids
D. all of the above
E. none of the above Right Ans - D. all of the above
During starvation or diabetes mellitus the brain derives most of its energy
from
A. fatty acids
B. glucose
C. ketone bodies
D. glycogen
E. fructose Right Ans - C. ketone bodies
Which receptor has inherent tyrosine kinase activity?
A. Epinephrine receptor
B. G protein receptor
C. Glucagon receptor
D. Insulin receptor
E. Testosterone receptor Right Ans - D. Insulin receptor
Which statement is correct concerning the pentose phosphate pathway?
A. It requires NAD+
B. It reduces G6P in the first step
C. It provides precursors for the synthesis of nucleotides
D. It is necessary for maintaining oxidized glutathione (GSSG)
, E. It generates 2 moles of ATP for every mole of glucose consumed Right
Ans - C. It provides precursors for the synthesis of nucleotides
Ribose-5-phosphate(R5P)
All of these enzymes in the TCA cycle require NAD+ except
A. Malate dehydrogenase
B. Succinate dehydrogenase
C. Isocitrate dehydrogenase
D. alpha-ketoglutarate dehydrogenase
E. All of the above require NAD+ Right Ans - B. Succinate dehydrogenase
Generates ubiquitol
The common intermediate metabolite of the urea and TCA cycle is
A. Arginine
B. Carbamoyl-phosphate
C. Fumarate
D. Glyoxylate
E. Succinate Right Ans - C. Fumarate
Nanoparticles are emerging as vehicles for drug delivery. Which structure in a
human cell has a dimension of about 20nm, resembling a nanoparticle?
A. Cell itslef
B. Ribosomes
C. Mitochondria
D. Nucleus
E. Cholesterol molecule Right Ans - B. Ribosomes
During heavy exercise, muscle tissue can undergo anaerobic metabolism to
produce lactate. What is the fate of this lactate?
A. It is converted back to pyruvate for gluconeogenesis in the muscle
B. It is transported to the liver for gluconeogenesis to produce glucose
C. It is converted to acetyl-CoA for the production of fatty acids to produce
ATP
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