Besides cAMP, which one of the following molecules acts as a “second messenger” in biological system?
A
c DNA
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B
c GTP
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C
ATP
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D
Ca2+
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Solution
The correct option is DCa2+
Second messengers are molecules that relay signals received at receptors on the cell surface — such as the arrival of protein hormones, growth factors, etc. — to target molecules in the cytosol and/or nucleus., e.g. Ca2+, cAMP.