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B
troponin
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C
tropomyosin
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D
none of the above
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Solution
The correct option is A filamentous actin Each actin (thin) filament is made of two ‘F’ (filamentous) actin molecules helically wound around each other. Each ‘F’ actin is a polymer of monomeric ‘G’ (globular) actins. Two filaments of another protein, tropomyosin, also run close to the ‘F’ actin molecules throughout their lengths. Troponin is a complex protein, which is distributed at regular intervals on tropomyosin.