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Actin Molecule

Which of the ...

Question

Which of the following is a component of thin filaments of a sarcomere?

A

Actin and myosin

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B

Troponin and actin

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C

Mysosin and troponin

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D

Troponin, tropomyosin, actin

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Solution

The correct option is D Troponin, tropomyosin, actin
Myofibrils consists of two types of contractile proteins, namely thick filaments and thin filaments. Thick filaments is composed of myosin only. Whereas thin filaments is composed of actin, tropomyosin and troponin. The sliding of thin filaments over thick filaments results in the muscle shortening.
Thus, the correct answer is 'Troponin, tropomyosin, actin.'

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Similar questions

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. Read the statements regarding muscle proteins. Which of the following statement is correct?
(A) Actin is a thin filament and is made up of two F-actins.
(B) The complex protein, tropomyosin is distributed at regular intervals on the troponin.
(C) Myosin is a thick filament, which is also a polymerised protein.
D) The globular head of meromyosin consists of light meromyosin (LMM).

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. Choose the option having all the correct statements:
I. Thin and thick filaments consist of myosin and actin, respectively.
II. The H-zone and I-band consists of only myosin and actin, respectively.
III. A-band contains both actin and myosin.
IV. M-line and Z-line are in the middle of thin and thick filaments, respectively.

Q. In the transverse section of myofibril, the region of A band where thick and thin filaments overlap, each actin filament is surrounded by __(A)__thick filaments and each myosin filament is surrounded by __(B)__ thin filaments.

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