题目内容

Which of the following mutations to the Gα protein could render（致使） a G protein-coupled receptor signaling pathway constitutively active?

A. Gα cannot bind Gβγ
B. Gαcannot hydrolyze GTP
C. Gα protein cannot bind GDP
D. Gα protein cannot release GDP

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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

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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

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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

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

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Which of the following mutations to the Gα protein could render（致使） a G protein-coupled receptor signaling pathway constitutively active?

A. Gα cannot bind Gβγ B. Gαcannot hydrolyze GTP C. Gα protein cannot bind GDP D. Gα protein cannot release GDP

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

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

All the following statements about heterochromatin are true except:

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

A. Gα cannot bind Gβγ
B. Gαcannot hydrolyze GTP
C. Gα protein cannot bind GDP
D. Gα protein cannot release GDP