Active Sites Become Exposed When Calcium Ions Bind To

Question

Active sites become exposed when calcium ions bind to
A) tropomyosin.
B) actin.
C) myosin.
D) troponin.
E) calcium channels.

Accepted Answer

Troponin is the regulatory protein in muscle contraction that binds to calcium ions and causes a conformational change, which moves tropomyosin out of the way and exposes the active sites on actin, allowing myosin to bind and initiate muscle contraction.