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The thin filament of a muscle fibril is made of two filamentous strands of
Amyosin
Btropomyosin
Ctroponin
Dactin
Answer & Solution
Correct answer: D. actin
1. Each thin filament is built from a repeating protein.
2. It is made of two filamentous, or F, actins helically wound to each other.
3. Each F actin is itself a polymer of monomeric G actins.
4. Tropomyosin runs alongside the actins, and troponin sits on the tropomyosin.
5. Myosin belongs to the thick filament, not the thin one.
_Source: NCERT Class 11 Biology Ch17 'Locomotion and Movement'_
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