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Structure of Skeletal Muscle

Active sites ...

Question

Active sites are unmasked when calcium binds with a subunit of

A

Troponin

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B

Tropomyosin

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C

Actin

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D

Myosin

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Solution

The correct option is A Troponin
During muscle contraction, active sites on tropomyosin are unmasked for the binding of myosin to actin. This happens when calcium binds with a subunit of troponin.

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Similar questions

Q. Active sites are unmasked when calcium binds with a subunit of

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. 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:

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

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