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Which of the following statements are co...

Which of the following statements are correct regarding muscle proteins ?
(i) Actin is a thin filament and is mde up to two F-actin
(ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin
(iii) Myosin is a thick filament which is also a polymerised protein.
(iv) The globular head of meromyosin consists of light meromyosin (LMM).

A

(i), (ii) and (iii)

B

(i), (ii) and (iv)

C

(i) and (iii)

D

(ii) and (iv)

Text Solution

Verified by Experts

The correct Answer is:
C
Each actin (thin) filament is made of two 'F' (filamentous) actin helically wound to each other. Each F actin is a polymer of monomeric 'G' (globular) actins. Myosin (thick) filament is a polymerised protein. Many monomeric proteins called meromyosins constitute one thick filament. Tropomyosin is a fibrous molecule that attached to F actin in the groove between its filament. The globular head of meromyosin consisit of heavy meromoysin.
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Knowledge Check

  • Read the statements regarding muscle proteins (A) Actin is a thin filament and is made up of two F-actins (B) The complex protein, tropomyosin is distributed at regular intervals on the troponin (C) Myosin is a thick filament which is also a polymerized protein (D) The globular head of mermyosin consists of light meromyosin (LMM) Of the above statements

    A
    (A),(B) and (C) are correct
    B
    (A), (B) and (D) are correct
    C
    (A) and (C) are correct
    D
    (B), (C) and (D) are correct

  • Read the statements regarding muscle Proteins and find the correct options : (i) Actin is a thin filament and is made up of two F - actins. (ii ) The complex protein , tropomyosin is distributed at regular intervals on the troponin. (iii) Myosin is a thick filament which is also a polymerized protein (iv) The globular head of meromyosin consists of light meromyosin

    A
    (i) , (ii) and (iii) are correct
    B
    (i) , (ii) and (iv) are correct
    C
    (i) and (iii) are correct
    D
    (ii) and (iv) are correct

  • Which of the following statements regarding the structure of contractile proteins are correct ? I. Each actin filaments is made up of two ' F ' actins, which are wound helically around each other. II. Two types of troponins are distributed at regular intervals on the tropomyosin . III. The globular head of meromyosin has binding sites for ATP and troponins. IV myosin is a structure proteins which also has enzymatic activity.

    A
    II, III and IV
    B
    I and IV
    C
    I,II and III
    D
    II and IV

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