GATE 2020 BM – Question 25
Which proteins comprise a muscle fibre’s thin filament?
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Correct answer: (A) Troponin, tropomyosin, actin
Explanation
Thin filaments contain actin together with regulatory tropomyosin and troponin, A. Myosin is the main thick-filament motor protein, while titin is a large elastic structural protein associated with sarcomere organization. These are not replacements for the thin-filament actin/regulatory trio.