Deck 3: Cell Signaling

Question 1

The binding of a ligand to a G protein--coupled receptor will result in activation of adenylyl cyclase, which in turn will initiate which of the following pathways?

A) Ca²⁺-calmodulin
B) cAMP
C) cGMP
D) MAP kinase
E) Phospholipase C-Ca²⁺

Answer 1

B

Question 2

Which of the following is most likely to initiate apoptosis?

A) Apaf-1
B) Bcl-2
C) Caspase 3
D) Caspase 9
E) DNA protein kinase

Answer 2

D

Question 3

A ligand binding to a(n) _____ receptor directly results in phosphorylation

A) Cytokine
B) G protein-coupled
C) Intracellular
D) Threonine kinase
E) Tyrosine kinase

Answer 3

E

Question 4

An action potential triggers the release of a(n)

A) Eicosanoid
B) Neurotransmitter
C) Paracrine
D) Peptide hormone
E) Steroid hormone

Question 5

A secreted chemical messenger meant to act on an adjacent cell is called a(n)

A) Autocrine
B) Hormone
C) Neurohormone
D) Neurotransmitter
E) Paracrine

Question 6

Which of the following functions by diffusing across the cell membrane to bind to intracellular protein receptors, resulting in gene activation or repression?

A) Acetylcholine
B) Insulin
C) Nitric oxide
D) Prostaglandin
E) Testosterone