When the Regulatory Domain of PKA Is Bound to CAMP

question 39

Multiple Choice

When the regulatory domain of PKA is bound to cAMP:

• A)the released catalytic subunit travels to the nucleus where it can phosphorylate CREB.
• B)the catalytic subunit acts on CRE to stimulate gene transcription.
• C)the AKAP adaptor protein sequesters the catalytic subunit.
• D)PDE is inhibited to cause cAMP levels to rise.

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Definitions:

Viable Gametes

Reproductive cells (sperm and eggs) that are capable of fertilization and supporting normal development.

Hybrid Inviability

A postzygotic barrier where hybrid offspring fail to survive to reproductive maturity.

Species Incompatibility

A biological impediment that prevents different species from interbreeding or producing fertile offspring due to genetic, behavioral, or physiological barriers.

Gametic Isolation

A mechanism of reproductive isolation where the gametes (egg and sperm) of different species are unable to fuse or recognize each other, preventing fertilization.