Second messengers are intracellular non-protein signalling molecules, such as cAMP, Ca2+, and inositol triphosphate (IP3), that are produced in response to the binding of an extracellular signalling molecule to a cell surface receptor. They then transmit the signal to the appropriate intracellular targets to create a cellular response.

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Second Messengers

Question 24

Multiple Choice

Second messengers

A) are intracellular non- protein signalling molecules.
B) are intracellular kinases which lead to a cellular response.
C) can synthesize cAMP from AMP and ADP.
D) are signalling molecules which bind directly to the G- protein coupled receptor.

Correct Answer: