Which Molecules Do Not Act as a Morphogen During Nervous

question 10

Multiple Choice

Which molecules do not act as a morphogen during nervous system development?

• A) Wnt
• B) cAMP
• C) FGFs
• D) Shh
• E) RA

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Definitions:

Primary Reinforcer

A naturally occurring stimulus like food or drink that is needed for survival and that intrinsically motivates or satisfies physiological needs.

Positive Reinforcer

A positive reinforcer is any stimulus that, when presented after a behavior, increases the likelihood of that behavior being repeated.

Secondary Reinforcer

Any reinforcer that becomes reinforcing after being paired with a primary reinforcer, such as praise, tokens, or gold stars.

Extinction

In psychology, the gradual weakening and eventual disappearance of a conditioned response when the conditioned stimulus is no longer paired with an unconditioned stimulus.