Problem: The class of cell surface receptors that act indirectly on plasma membrane-bound enzymes or ion channels are calleda.  G protein coupled receptors b.  gated channelsc.  enzymic receptorsd.  second messengers 

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The class of cell surface receptors that act indirectly on plasma membrane-bound enzymes or ion channels are called

a.  G protein coupled receptors 

b.  gated channels

c.  enzymic receptors

d.  second messengers