Professor Van Zile tells his class that, in a resting muscle fiber, _________ binding sites are covered by a protein called _________.
A) actin; tropomyosin
B) actin; troponin
C) myosin; tropomyosin
D) myosin; troponin

Question

Quizplus · Accepted Answer

In a resting muscle fiber, actin binding sites are covered by tropomyosin, which blocks the binding site and prevents myosin from binding to actin. Troponin is also involved in muscle contraction but it does not cover the binding sites in a resting muscle fiber.

Professor Van Zile Tells His Class That, in a Resting