Question

in order to stimulate a muscle fiber to contract, where should calcium bind to and what should happen as a result? question 6 (1 point) g - actin; rolls away troponin to reveal active site on tropomyosin g - actin; rolls away tropomyosin to reveal active site on troponin tropomyosin; rolls away troponin to reveal active site on g - actin troponin; rolls away tropomyosin to reveal active site on g - actin

Explanation:

In muscle contraction, calcium ions bind to troponin. This causes a conformational change in troponin which moves tropomyosin away from the active sites on G - actin, allowing myosin to bind and initiate contraction.

Answer:

No options are clearly marked as correct in the provided image. However, in muscle - contraction, calcium binds to troponin, and then tropomyosin rolls away to reveal the active site on G - actin. So, if we assume the correct option is the one that follows this mechanism, it would be the one that says "troponin; rolls away tropomyosin to reveal active site on G - actin".