Extensive Data from Hospitals Have Shown That Infants Born with Intermediate

question 69

Multiple Choice

Extensive data from hospitals have shown that infants born with intermediate weights are the ones most likely to survive. This is a classic example of which type of selection?

• A) directional selection
• B) stabilizing selection
• C) disruptive selection
• D) natural selection
• E) no selection

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Definitions:

CAMP

Cyclic adenosine monophosphate; a second messenger important in many biological processes.

Protein Kinase

Class of enzymes that phosphorylates other proteins. Many of these kinases are responsive to other chemical signals (e.g., cAMP, cGMP, insulin, epidermal growth factor, calcium, and calmodulin).

Intracellular Mediator

Molecules inside cells that transmit signals from a cell receptor to a target, playing a key role in cell signaling pathways.

Hormonal Secretion

The release of hormones into the bloodstream by endocrine glands, which then travel to target organs or tissues to exert their effects.