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Question

In a resting muscle fibre, troponin partially covers

A
Ca binding sites on actin
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B
Ca binding sites on troponin
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C
actin binding site on myosin
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D
myosin binding site on actin
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Solution

The correct option is D myosin binding site on actin
Each actin filament is made up of two F actins (polymer of G actin) that are helically wound to each other. Two filaments of a protein called tropomyosin run close to the F actins throughout its length. A protein called troponin is distributed at regular intervals on the tropomyosin. In the resting state, a subunit of troponin masks the active binding sites for myosin on the actin filaments.

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