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In a resting muscle, which protein subunit hides the myosin-binding sites on actin?
AMyoglobin
BTroponin
CTropomyosin
DMeromyosin
Answer & Solution
Correct answer: B. Troponin
1. Troponin sits at intervals along tropomyosin.
2. At rest one of its subunits covers the active sites.
3. So myosin cannot bind until calcium moves troponin.
_Source: NCERT Class 11 Biology, Chapter 20, Locomotion and Movement._
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