SAT Subject Biology Practice Question 155: Answer and Explanation

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Question: 155

5. An allele that codes for all actin molecules to be synthesized in linear chains would result in

A. immovable muscles
B. smooth muscle tissue
C. normal sarcomere structure
D. degeneration of muscle tissue
E. muscle tendons that cannot attach

Correct Answer: C


Muscle tissue is composed of two proteins: actin and myosin. Actin forms long chains, while myosin is arranged in bundles. These two proteins are arranged to form sarcomeres. If this mutation does not affect the linear structure of actin proteins, then sarcomere structure will be unaffected.

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