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Actin Molecule

Which of the ...

Question

Which of the following is not a component of a thin filament?

A

Actin

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B

Myosin

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C

Troponin

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D

Tropomyosin

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Solution

The correct option is B
Myosin

Thin filament is composed of actin, troponin, and tropomyosin. Myosin contains an actin-binding site, by which it can interact with a thin filament and an ATP-binding site that is involved in the supply of energy and tail.

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Similar questions

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

Actin binding sites are located on

(i) Myosin

(ii) Tropomyosin

(iii) Troponin

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. Assertion: Calcium ions play a crucial role in muscle contraction.
Reason: Calcium ions bind troponin causing the displacement of tropomyosin, allowing the myosin head to bind actin.
Select the appropriate option:

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