题目内容

Which enzyme plays a role in regulating rhodopsin-induced closing of cation channels?

A. guanylyl cyclase
B. adenylyl cyclase
C. phosphodiesterase
D. a and c

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Which enzyme plays a role in regulating rhodopsin-induced closing of cation channels?

A. guanylyl cyclase
B. adenylyl cyclase
C. phosphodiesterase
D. A and C

All the following statements about heterochromatin are true except:

A. It is a dark-staining area of a chromosome
B. It is usually transcriptionally active
C. It is often simple sequence DNA
D. It is a region of condensed chromatin

Not all second messengers are water-soluble and diffuse freely through the cytosol.

Disulfide Bonds Are Formed only in the lumen of the rough ER

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