Amplification of a Second-Messenger Cascade Can Take Place at Which

question 14

Multiple Choice

Amplification of a second-messenger cascade can take place at which level of a signal cascade?

• A)One activated receptor can activate numerous G proteins.
• B)One activated G protein can activate numerous effector enzymes.
• C)One active effector enzyme can catalyze numerous reactions.
• D)One activated protein kinase can allosterically modulate numerous proteins.
• E)All of the choices are correct.

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Definitions:

Set-Point Theory

The concept that individuals have a genetically predetermined weight or body fat level that the body regulates and maintains.

Glucostatic Theory

A theory suggesting that blood glucose levels regulate feelings of hunger and satiety, thus influencing eating behavior.

Lipostatic Theory

A theory suggesting that body fat regulation is achieved through a feedback mechanism that controls food intake and energy expenditure.

Sensory Specific Satiety

The reduced desire to continue consuming a particular food due to the sensory properties (taste, smell, etc.) of that food.