Question

There are three blanks in the following statement. Mark the correct option having suitable words for filling the blanks :
The thin filaments of myofibril contain ……..’a’…….actin and two filaments of …….. ‘b’ ……. Protein along with ….. ‘c’ …… protein for masking binding site for myosin

• A.
  

  (D)

  2F

  Tropomyosin

  Troponin

• B.

  (B)

  1F

  Tropomyosin

  Troponin

• C.

  (C)

  2F

  Troponin

  Tropomyosin

• D.
  

  (A)

  1F

  Troponin

  Tropomyosin

Answer 1

The correct option is D

(A)

1F

Troponin

Tropomyosin

A thin filament of myofibril contains 2 ‘F’ actins and two other proteins, namely troponin and tropomyosin. Tropomyosin and troponin regulate muscle contraction. Troponin binds to the calcium ions and removes the tropomyosin from the actin myosin-binding site, which allows the muscle contraction.

Thin filaments of myofibril contain one filament of actin and two filaments of troponin, along with tropomyosin protein.
So, the correct option is 'A - 1F B - troponin C - Tropomyosin'.