How Is Signaling by an Activated G_α Subunit Terminated

question 65

Multiple Choice

How is signaling by an activated G_α subunit terminated?

• A)The bound GTP is hydrolyzed to GMP.
• B)The bound GDP is hydrolyzed to GTP.
• C)The bound GTP is hydrolyzed to GDP.
• D)The bound GDP is phosphorylated to GTP.
• E)The G_α subunit releases GDP and binds GTP.

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Definitions:

Classical Conditioning

A learning process that occurs when two stimuli are repeatedly paired: a response which is at first elicited by the second stimulus is eventually elicited by the first stimulus alone.

Conditioned Stimulus

A previously neutral stimulus that, after association with an unconditioned stimulus, comes to trigger a conditioned response.

Unconditioned Stimulus

In classical conditioning, a stimulus that naturally and automatically triggers an unconditioned response without the need for prior learning.

Synaptic Pruning

A natural process of brain development in which extra neurons and synaptic connections are eliminated to increase the efficiency of neuronal transmissions.