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Smntnl Smntnl
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11 years ago
A) K
B) Na
C) P
D) Ca
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wrote...
11 years ago
D) Ca

The tropomyosin molecule blocks the active sites of the actin. Troponin is a molecule that is bound to the tropomyosin. Troponin needs CA+ (calcium ions) to bind to it in order to rotate the tropomyosin molecule and expose the actin molecules for the myosin heads to interact for muscle contraction.
wrote...
11 years ago
Actin is a polymer (chain of linked molecules) that is wrapped by tropomyosin.  The tropomyosin blocks the myosin-binding site by when Calcium ions bind it causes a change in protein configurations that exposes the myosin-binding site so the myosin head can bind.
wrote...
11 years ago
The answer is D.
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