Which term is the smallest subdivision in this group?

fiber

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fibril

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filament

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actin

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Solution

The correct option is D
actin

Each mucle fiber is composed of many myofibrils.Each myofibril is composed of actin and myosin filaments.Each actin filament is composed of three proteins actin,troponin and tropomyosin.

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Solid, unbranced, rod like fibrils of indefinite length composed of actin protein may provide/form

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