The cell surface receptors that can act only indirectly on plasma membrane-bound enzymes or ion channels are called:

A. G protein-coupled receptors.
B. gated ion channels.
C. enzymatic receptors.
D. second messenger receptors.


A. G protein-coupled receptors.

Biology & Microbiology

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Fill in the blank(s) with the appropriate word(s).

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The cerebrum is more developed in monkeys, apes, and humans compared to other primates

____________________ Indicate whether the statement is true or false.

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Chromsomes HAVE to carry exactly the same alleles as their homologue.

a. true b. false

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Specimens are prepared for ________ microscopy using electron-dense stains.

A. atomic probe B. bright-field C. confocal D. transmission electron E. scanning tunneling

Biology & Microbiology