Who masks the active binding site for myosin on actin ? Tropnin or tropomyosin ? ( Becos its given troponin and also tropomyosin in aakash module )

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Solution

masking is done by tropomyosin

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Similar questions

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

Match the following.

$\begin{matrix} Column I & Column II i. Troponin & a. Blocks the attachment site for the myosin cross bridge ii. Tropomyosin & b. Has a myosin binding site iii. Actin & c. Complex of 3 polypeptide units \end{matrix}$

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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