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Question

Active sites are unmasked when calcium binds with a subunit of
  1. Troponin
  2. Tropomyosin
  3. Actin
  4. Myosin


Solution

The correct option is A Troponin
During muscle contraction, active sites on tropomyosin are unmasked for the binding of myosin to actin. This happens when calcium binds with a subunit of troponin.

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