Q.

Troponin is called a regulatory protein of the skeletal muscle fibre because it

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a

Stimulates the ATPase activity of myosin

b

Acts as ATPase providing energy for muscle contraction

c

Plays a role in masking and unmasking of active sites

d

Sequesters calcium ions in a relaxing muscle fibre

answer is C.

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Detailed Solution

Actin and myosin, which generate force during contraction are called contractile proteins. Troponin and tropomyosin are called regulatory proteins because of their role in masking and unmasking the active sites. Structural proteins like titin and nebulin keep thick and thin filaments in proper alignment.
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