Question

1. The signaling molecule diacylglycerol (DAG) often acts by: A. stimulating the formation of cGMP. B....

1. The signaling molecule diacylglycerol (DAG) often acts by:

A. stimulating the formation of cGMP.

B. activating a specific protein kinase.

C. opening Ca2+ channels in the cell.

D. binding to DNA and altering gene expression.

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Answer #1

The answer is option B. Activating a specific protein kinase.

The diacylglycerol (DAG) is a second messenger and they are signaling molecule produced in the cells by the signals from the primary messengers outside of the cells. The DAG are present in all mutlticellular organisms and they act by binding and activating a specific protein kinase C. It also increases the activity of protein kinase C by improving it's affinity for Ca++.

Other options do not correlate with the action of DAG.

     

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