Choose the correct answer from the alternatives given.
Second messengers include:

steroid hormones

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cyclic AMP

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protein hormones

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both (a) and (b)

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Solution

The correct option is A cyclic AMP
Hormones which interact with membrane-bound receptors normally do not enter the target cell but generate second messengers (eg, cyclic AMP, IP3, Calcium Ions etc) which in turn regulate cellular metabolism. Hormones which interact with intracellular receptors (eg, steroid hormones, iodothyronines, etc) mostly regulate gene expressions or chromosome function by the interaction of hormone receptor complex with the genome.
So the correct answer is cyclic AMP.

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