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Muscle

Thin filament...

Question

Thin filament is made up of

A

Actin, troponin and tropomyosin

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B

Actin and troponin

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C

Myosin and troponin

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D

Actin and tropomyosin

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Solution

The correct option is B Actin, troponin and tropomyosin
Troponin is a component of thin filaments along with actin and tropomyosin and this is the protein complex to which calcium binds to trigger the production of muscular force. One thin filament consists about 400 actin molecules and around 50 molecules of tropomyosin and troponin each.
So, the correct answer is option A.

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

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 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. 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. Which of the.following statements are correct regarding muscle proteins ?
(i) Actin is a thin filament and is Frock up of two F-actirs.
(ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin.
(iii) Myosin is a thick flament which is also a polymerised protein.
(iv) The globular head of meromyosin consists of light merornyosin (LMM).

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