MCQ
The name 'second messenger' is given to which of the following?
  • A
    $\text{ATP}$
  • B
    Cyclic $\text{AMP}$
  • C
    $\text{GTP}$
  • Both $\text{ATP}$ and $\text{AMP}$

Answer

Correct option: D.
Both $\text{ATP}$ and $\text{AMP}$
Second messengers are the low molecular weight molecules that serve to transmit and amplify the signal of hormones, the first messenger, to initiate the downstream enzyme cascade inside the cell. $\text{cAMP}$ serves as the second messenger in almost all the cells while $\text{ATP}$ and $\text{GTP}$ are the energy currencies of the cell.

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