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Actin Molecule

Monomeric act...

Question

Monomeric actin is known as

A

F-actin

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B

M-actin

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C

G-actin

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D

N-actin

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Solution

The correct option is B G-actin
Skeletal muscle fiber is made up of two types of filaments. They are thick filament(myosin) and thin filament(actin).
Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other. Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins.
Hence monomeric actin is known as G-actin.
So,the correct answer is 'G-actin'.

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Q. Actin is present in thin filament.

Q. The G-actin polymerises to form the F-actin in the presence of ____________

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).

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