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Actin Molecule

The filaments...

Question

The filaments of myofibril are made up of

A

Actin, troponin, tropomyosin

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B

Actin, troponin

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C

Myosin, troponin

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D

Actin, tropomyosin

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Solution

The correct option is A Actin, troponin, tropomyosin
Myofibrils are the contractile fibres that are present in the striated muscles and are also called as the muscle fibres. They are composed of the thick and thin filaments called the actin and myosin along with the troponin and tropomyosin muscle proteins.

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Q. The filaments of myofibril are made up of?

Q. The further treatment of fibres with saturated salt solutions removes actin and its two associated proteins tropomyosin and troponin and also destroy the I-bands. This shows that the thin filaments are made up of................. proteins.

Q. Read the following statements:

(a) Each thin filament is made of two F-actins.

(b) Each G-actin is polymer of F-actins.

(c) Two filaments of tropomyosin run close to the F-actins throughout it's length.

(d) Troponin is distributed at irregular internals on the tropomyosin.

(e) During contracted state a subunit of troponin masks the actin binding sites for myosin on the actin filaments.

Choose the correct statement(s).

Q. Tropomyosin is found on myosin whereas, troponin is found on actin filament.

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