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  4. In the thin filament of skeletal muscle fibre, a small globular protein that masks the active sites on the F-actin is:

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Q. In the thin filament of skeletal muscle fibre, a small globular protein that masks the active sites on the F-actin is:

NTA AbhyasNTA Abhyas 2022

Solution:

The thin filament of skeletal muscle fibre is composed of three distinct proteins, i.e., $ \, $ actin, tropomyosin and troponin. Troponin-I inhibits the F-actin–myosin interaction and also binds to other components of troponin. Tropomyosin is a fibrous molecule that attaches to F-actin in the groove between its filaments.