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a
Light meromyosin – Head and short arm
b
G actin – Polymer of F actin
c
Heavy meromyosin – ATPase
d
Tropomyosin – Ca++ binding site
answer is C.
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Detailed Solution
The globular head of meromyosin is an active ATPase. The head and short arm are made up of heavy meromyosin. The tails are made up of light meromyosin. F actin is a polymer of G actins. Ca++ binds to a subunit of troponin.