The receptors for a group of signaling molecules known as growth factors are often

A) ligand-gated ion channels.
B) G protein-coupled receptors.
C) cyclic AMP.
D) receptor tyrosine kinases.
E) neurotransmitters.


Ans: D) receptor tyrosine kinases.

Biology & Microbiology

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Which cells produce antibodies?

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Four of the five items listed below are related

to genetic information. Select the EXCEPTION.

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Fossil evidence shows that all modern human populations evolved from human ancestors in Africa

Indicate whether the statement is true or false

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