Question

A common feature of molecules that signal through steroid and metabolite hormone receptors is:

	A.	their receptors signal through second messengers.
	B.	they are polar
	C.	they are hydrophobic
	D.	their receptors are mostly found in the cell surface membrane
	E.	their receptors signal rapidly

Answer 1

Cell signalling is of three types, endocrine, paracrine, and autocrine. Cell signalling molecules takes help from the receptors. There are receptors that express inside the cell cytosol or the nucleus. These receptors can respond to the signalling molecules which are able to diffuse across the plasma membrane. Steroid hormones are examples for it.

They generally are derived from cholesterol. They have hydrophilic functional groups at either end and hydrophobic carbon backbones.

These molecules do not have their receptors signal through second messengers. They are not polar either. This is wrong too- their receptors are mostly found in the cell surface membrane. Their receptors don't rapidly signal either.

The right answer is C.