Myostatin Mutations That Increase Muscle Mass May Not Be Favored

question 64

Multiple Choice

Myostatin mutations that increase muscle mass may not be favored by evolution because

• A) larger muscles in animals that have impaired myostatin production actually produce less force than normal muscles.
• B) larger muscles fatigue more rapidly in myostatin-null animals.
• C) impaired atrophy may deprive myostatin-null animals of the amino acids needed for physiological processes in non-muscle tissues.
• D) the high degree of conservation of the myostatin sequence in different tetrapods indicates that the gene is not important in most animals.

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Definitions:

Reticul/o

A prefix in medical terminology related to the reticular formation in the brain or reticulated (net-like) structures in anatomy.

-Penia

A suffix used in medical terminology to denote a deficiency or decrease in the number of something, as in "leukopenia" (decrease in white blood cells).

Thromb/o

A prefix meaning clot, often used in medical terms related to blood clotting.

-Emia

A suffix in medical terminology indicating a condition of the blood.