With Regard to Alleles That Encode Different Forms of Beta-Hemoglobin

question 155

Multiple Choice

With regard to alleles that encode different forms of beta-hemoglobin in humans and their relation to malaria, which of the following are examples of phenotypes?

• A)sickle-cell anemia
• B)AA, AS, SS
• C)susceptibility to malaria
• D)sickled red blood cells
• E)allele C

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Definitions:

Hyperpolarization

An increase in the membrane potential of a cell, making it more negative and less likely to fire an action potential.

Resting Membrane Potential

The electrical charge difference across the plasma membrane when a neuron or muscle cell is at rest.

Muscle

Tissue composed of fibers that can contract, causing movement of parts of the body.

Smooth Muscle Cells

Individual cells that make up smooth muscle, characterized by their ability to contract without voluntary control.