Match each definition in the first column to the correct term in the second column.
-Covers the myosin binding sites on actin.

Question

Quizplus · Accepted Answer

Tropomyosin is a protein that covers the myosin binding sites on actin.

Answer: H
 Troponin is a protein that binds to calcium ions and shifts tropomyosin to expose the myosin binding sites on actin.

Answer: G
 Myosin is a protein that forms thick filaments in muscle fibers and binds to actin during muscle contractions.

Answer: J
 Calcium ions are necessary for muscle contraction as they bind to troponin, which in turn moves tropomyosin to reveal the myosin binding sites on actin.

Answer: K
 Actin is a protein that forms thin filaments in muscle fibers and binds to myosin during muscle contractions.

I and E are not mentioned in any of the definitions, and A, B, and C are unrelated to muscle contraction.

Match Each Definition in the First Column to the Correct