A Gene Affects an Organism's Phenotype by Controlling

question 76

Multiple Choice

A gene affects an organism's phenotype by controlling

• A) protein production.
• B) the mutation rate.
• C) the organism's environment.
• D) the organism's ribosomes.

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Definitions:

Tetanus

A bacterial disease marked by rigidity and spasms of the muscles, caused by a toxin produced by Clostridium tetani.

Sarcomere

The basic unit of a muscle's cross-striated myofibril, responsible for muscle contraction and defined by the area between two Z lines.

Actin

One of two major proteins of muscle; makes up thin filaments in myofibrils of muscle fibers. See also myosin.

Myosin

A type of protein found in muscle tissue as a thick filament that plays a key role in muscle contraction and movement.