How Are G Protein-α-Subunits Anchored into Membranes

question 7

Multiple Choice

How are G protein-α-subunits anchored into membranes?

• A)by amine-linked myristoyl anchors
• B)by thioester-linked fatty acyl anchors
• C)by amide-linked prenyl anchors
• D)by thioester-linked prenyl anchors

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Definitions:

Apoenzyme

Protein portion of an enzyme; requires the presence of a specific coenzyme to become a complete functional enzyme.

Nonpolypeptide

A molecule or substance that does not consist of polypeptide chains, typically referring to chemicals or biological molecules outside the class of proteins.

Coenzyme

An organic cofactor for an enzyme; generally participates in the reaction by transferring some component, such as electrons or part of a substrate molecule.

Apoenzyme

The protein component of an enzyme, to which a coenzyme or cofactor must bind to form an active enzyme.