Cell Signalling and Transduction – Section 1

1. Small charged molecules, often biogenic amines function as

A. hormones
B. neurotransmitters
C. both (a) and (b)
D. none of these

Correct Answer: C. both (a) and (b)

2. SH2 domains specifically bind to

A. phosphorylated serine residues
B. phosphorylated tyrosine residues
C. GDP
D. Ca2+

Correct Answer: B. phosphorylated tyrosine residues

3. In paracrine signaling, the signaling molecules affects only

A. target cells close to the cell from which it was secreted
B. target cells distant from its site of synthesis in cells of an endocrine organ
C. both (a) and (b)
D. none of the above

Correct Answer: A. target cells close to the cell from which it was secreted

4. Simple nerve reflexes use signaling molecules called

A. neurotransmitters
B. nitric oxides
C. G proteins
D. proteases

Correct Answer: A. neurotransmitters

5. Which of the following is not a type of signaling molecule?

A. Testosterone
B. Insulin
C. Thyroxin
D. Adenylate cyclase

Correct Answer: D. Adenylate cyclase

Leave A Comment?

fourteen − four =