Protein conformational change is essential during the molecular sequence of events of muscle contraction.If the muscle begins in a relaxed mode and is stimulated to contract by a nerve impulse,what is the correct order of protein conformational changes that will follow?
A) Myosin,troponin,tropomyosin
B) Troponin,tropomyosin,myosin
C) Tropomyosin,myosin,troponin
D) Myosin,tropomyosin,troponin
E) Tropomyosin,troponin,myosin

Question

Quizplus · Accepted Answer

When a muscle is stimulated to contract, calcium ions bind to troponin, causing tropomyosin to move away from the myosin-binding sites on actin filaments. This allows myosin heads to bind to actin and undergo conformational changes, leading to the sliding of actin filaments over myosin filaments and muscle contraction. Therefore, the correct order of protein conformational changes is troponin, tropomyosin, myosin. Choice B is the only answer option that reflects this correct order.

Protein Conformational Change Is Essential During the Molecular Sequence of Events