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Myosin Molecule

ATPase of the...

Question

ATPase of the muscle is located in

(a) actinin (b) troponin (c) myosin (d) actin

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Solution

Option (c) myosin

The globular head of myosin in muscle is an active ATPase enzyme having binding sites for ATP and active site for actin.

While the ATPase is not found in actinin, troponin or actin of muscle fibre.

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Similar questions

Actin binding sites are located on

(i) Myosin

(ii) Tropomyosin

(iii) Troponin

Q. ATPase of the muscle is located in:

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. Enzyme ATPase required for muscle contraction is located in

Q. During muscle contraction, the correct sequence of events is:

(A) Binding of myosin head to exposed active site of actin forming the cross-bridge by utilising the energy from hydrolysis of ATP

(B) Binding of

C a^{+ +}

with troponin of actin filaments and thereby removing the masking of active sites for myosin

(C) Releasing the ADP and Pi from myosin so it can go back to its relaxed state

(D) Release of acetylcholine at neuromuscular junction which generates action potential in the sarcolemma

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Myosin Molecule

Standard XII Biology

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