It can lead to a decrease in calcium levels in the cell

It responds to changes in voltage across the membrane

It responds to insulin

It is only found in the central nervous system

The alpha subunit of a G protein has an intrinsic GTPase, which converts GTP back to GDP

A GTPase enzyme comes in contact with the G protein, which converts GTP back to GDP

The beta subunit of a G protein has an intrinsic GTPase, which converts GTP back to GDP

The gamma subunit of a G protein has an intrinsic GTPase, which converts GTP back to GDP

GTP dissociates completely from the G protein reverting it back to its inactive state

Alpha subunit

Beta subunit

Gamma subunit

All of these answers

None of these answers

G-protein coupled receptors contain nine transmembrane alpha helices.

A Cys-S linked palmitoyl group faces the extracellular region.

G protein-coupled receptors may be desensitized by serine phosphorylation.

When GTP binds to the alpha subunit of the G protein, the beta-gamma subunit dissociates from the alpha subunit.

adenylate cyclase . . . cAMP

phospholipase C . . . protein kinase c

the sodium-potassium pump . . . membrane potential

voltage gated channels . . . muscle contraction

G protein-coupled receptor

Receptor tyrosine kinase

Ionotropic receptor

Intracellular receptor

Dihydropyridine receptor

The alpha subunit dissociates from the beta/gamma unit upon conversion of GDP to GTP

The alpha subunit dissociates from the beta/gamma unit upon conversion of GTP to GDP

The beta unit dissociates from the alpha/gamma unit upon conversion of GTP to GDP

The beta unit dissociates from the alpha/gamma unit upon conversion of GDP to GTP

The heterotrimeric G protein remains intact as a single unit, but GTP is converted to GDP

The Gq subunit stimulates adenlyate cyclase to produce cAMP.

Toxins such as cholera and pertussis can inhibit certain steps in the G protein pathway.

Mammalian adeylate cyclases have nine different isoforms, and the structure is predicted to be six transmembrane helices.

Adenylate cyclase is involved in the initial pathway that activates protein kinase A by binding four cAMP molecules.

cAMP-phosphodiesterases limit second messenger activity.

, , and are 3 types of G-proteins

The subunit of the G-protein detaches once GDP is converted to GTP

The subunit reattaches once the GTP gets hydrolyzed to GDP

One mechanism of G-proteins activates the phosphoinositide cascade

cAMP

DAG (diacylglycerol)