Quiz Questions

Question 1

An elevated insulin level in the blood

Answer 1

stimulates synthesis of fatty acids and triacylglycerols in the liver.

Question 2

Which of the following is not involved in triggering insulin release from β-cells in response to glucose?

Answer 2

cAMP-dependent phosphorylation of lipase

Question 3

Which of the following statements concerning receptor enzymes is correct?

Answer 3

They contain an enzyme activity that acts on a cytosolic substrate.

Question 4

Differentiation of blood cells and control of lymphocytes during the immune response is regulated by which type of signaling molecule?

Answer 4

Cytokines

Question 5

Signaling by the steroid hormone progesterone is an example of _______ signaling.

Answer 5

Endocrine

Question 6

The G protein that activates adenylyl cyclase is a

Answer 6

trimeric G protein that separates into α and βγ subunits when activated.

Question 7

In amino acid catabolism, the first reaction for many amino acids is a(n)

Answer 7

transamination requiring pyridoxal phosphate (PLP).

Question 8

Which of the following is not true of the reaction catalyzed by glutamate dehydrogenase?
A.
It is similar to transamination in that it involves the coenzyme pyridoxal phosphate (PLP).

B.
NH4+ is produced.

C.
The enzyme can use either NAD+ or NADP+ as a cofactor.

D.
α-Ketoglutarate is produced from an amino acid.

Answer 8

It is similar to transamination in that it involves the coenzyme pyridoxal phosphate (PLP).

Question 9

The hormones epinephrine and norepinephrine are derived biosynthetically by?

Answer 9

Tyrosine

Question 10

Which of the following opsins acts as a proton pump?

A. bacteriorhodopsin

B.
channelrhodopsin

C.
halorhodopsin

D.
OptoXR

Answer 10

Bacteriorhodopsin