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Muscle Tissue

Which of the ...

Question

Which of the following is correctly matched?

A

actin -- major component of the A band of a sarcomere

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B

myosin -- major component of thick filaments

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C

tropomyosin -- calcium binding protein of skeletal muscle

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D

troponin -- interferes with the binding of myosin to actin

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Solution

The correct option is B
myosin -- major component of thick filaments

Muscles are composed of two major protein filaments: a thick filament composed of the protein myosin and a thin filament composed of the protein actin.

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Similar questions

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:

Actin binding sites are located on

(i) Myosin

(ii) Tropomyosin

(iii) Troponin

Q. The globular head of mysosin has:
I. ATP binding site
II. Actin binding site
III. Myosin binding site
IV. Troponin binding site
V. Calcium binding

Q. The globular head of mysosin has
I. ATP binding site
II. Actin binding site
III. Myosin binding site
IV. Troponin binding site
V. Calcium binding

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).

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