An intracellular messenger molecule generated by the binding of a chemical messenger (hormone or neurotransmitter) to a plasma membrane receptor on a cells outer surface; mediates intracellular responses to an extra-cellular (first) messenger.

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

An intracellular messenger molecule generated by the binding of a chemical messenger (hormone or neurotransmitter) to a plasma membrane receptor on a cell’s outer surface; mediates intracellular responses to an extra-cellular (first) messenger.

A	steroid hormone
B	hormone
C	second messenger
D	aldosterone

Explanation:

Detailed explanation-1: -Answer and Explanation: A signal molecule that binds to an intracellular receptor molecule are usually small, hydrophobic molecules. One of the most common classes of molecules which bind to intracellular receptors are hormone signal molecules.

Detailed explanation-2: -Intracellular messengers: cyclic adenosine monophosphate (cAMP), cyclic guanosine monophosphate, calcium, phosphatidylinositols, nitric oxide (NO), and diacylglycerol.

Detailed explanation-3: -Intracellular receptors When a hormone enters a cell and binds to its receptor, it causes the receptor to change shape, allowing the receptor-hormone complex to enter the nucleus (if it wasn’t there already) and regulate gene activity.

Detailed explanation-4: -Integrins are receptors in the plasma membranes of cells. They are multisubunit transmembrane proteins. They have large extracellular domains, consisting of individually structured subdomains covalently linked by flexible linkers.

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GENERAL HISTOLOGY

CONNECTIVE TISSUE GLAND

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