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1.

Which of the following types of cells would have the HIGHEST level of connexin expression?

A.

skeletal muscle
B.

red blood cells
C.

heart
D.

sperm cells
E.

all of the above would have equal levels of expression

2.

Which subunit(s) of the heterotrimeric G protein, when mutated, has/have the potential for permanent activity of the signaling pathway?

A.

α
B.

β
C.

γ
D.

α and β
E.

β and γ

3.

_____ may be effective anti-cancer drugs.

A.

Monoclonal antibodies against offending receptors
B.

EGF mimics
C.

Protein kinase inhibitors
D.

All of the answers are correct.
E.

Both monoclonal antibodies against offending receptors and protein kinase inhibitors

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Trinidad Tremblay
Trinidad TremblayLv2
28 Sep 2019

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(a) GTP hydrolysis by the protein

(b)Activation of an upstream GTPase-activating protein

(c)Exchange GDP for GTP by the activation of an upstream guanine nucleotide exchange factor(GEF)

(d)Pi release after GTP hydrolysis

2/ Which of the following inactivates a G-protein?

(a) The β subunit exchanges its bound GDP for GTP.

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