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Question

Match the following.

Column IColumn IIi. Troponina. Blocks the attachment site for the myosin cross bridgeii. Tropomyosinb. Has a myosin binding siteiii. Actinc. Complex of 3 polypeptide units


A

i).→ c ., ii). → b., iii). →a.

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B

i). →b., ii). → a., iii). →c.

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C

i). → c., ii). → a., iii). →b.

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D

i) →a., ii). → c., iii). →b.

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Solution

The correct option is C

i). → c., ii). → a., iii). →b.


The thin filament is made of three separate proteins: actin, troponin, and tropomyosin. Actin has a myosin binding site for the cross bridge formation.
Troponin is a complex of three Polypeptide units(Troponin C, I and T). In a relaxed muscle, tropomyosin blocks the attachment site for the myosin cross bridge, thus preventing contraction.



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