The Binding of a Ligand to a G Protein--Coupled Receptor

question 4

Multiple Choice

The binding of a ligand to a G protein--coupled receptor will result in activation of adenylyl cyclase, which in turn will initiate which of the following pathways?

• A) Ca²⁺ -calmodulin
• B) cAMP
• C) cGMP
• D) MAP kinase
• E) Phospholipase C-Ca²⁺

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Definitions:

Sexual Desire Disorder

A condition marked by a lack or absence of sexual desires or fantasies, which can significantly affect relationships and emotional health.

Estrogen

A hormone (the so-called female sex hormone) that promotes the development and maintenance of female physical characteristics and that is involved in sexual activity and desire,

Testosterone

A hormone (the so-called male sex hormone) that stimulates development of male secondary sexual characteristics and that is involved in sexual activity and desire, variations in the level of which can lower or increase sex drive.

Prolactin

A hormone that helps initiate and maintain breast milk production in pregnant and nursing women, and that is involved in sexual activity and desire, variations in the level of which can lower or increase sex drive.