Intracellular receptors are mostly

Given below are two statements.
Statement $I$: Mode of action of catecholamines,peptide and polypeptide hormones is through cell membrane receptors.
Statement $II$: These hormones are non-steroid,water soluble and lipid insoluble hormones.
In the light of above statements,choose the correct option from below:

Which of the following is an example of negative feedback control in humans?

Select the correct statement regarding the interaction between the nervous and endocrine systems.

Cyclic adenosine monophosphate $(cAMP)$ was discovered by

Which of the following hormones regulates gene expression?