A cell’s response to a hormone signal diminishes as a result of a) releae of sec

Question

A cell’s response to a hormone signal diminishes as a result of

a) releae of second messengers

b) dephosphorylation of the hormone

c) desensitization

d) ligand binding to a receptor

Before a G protein can activate adneylate cyclase,

a) it releaes a second messenger

b) it dissociates into two parts

c) it phosphorylates the enzyme

d) it hydrolyzes GTP

Arrestin helps terminate signaling by binding to

a) a hormone

b) a G protein

c) a second messenger

d) a G protein-coupled receptor

Choose the true statement.

a) G proteins phosphorylate receptor tyrosine kinases

b) Receptor tyrosine kinases include seven transmembrane segments

c) Receptor tyrosine kinases undergo autophosphorylation

d) Active receptor tyrosine kinases are monomeric proteins

Lipid hormones...

a) act only on nearby cells

b) occur only in animals

c) bind to intracellular receptors

d) are too polar to pass through cell membranes

Eicosanoids

a) block hormone signaling

b) are a type of receptor

c) are derived from membrane lipids

d) occur only in plants

Explanation / Answer

1

A cells response to a hormone signal is diminished as a result of desensitization.

Reason : Desensitization is defined as the diminished response to a hormone signal.

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