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Excitation Contraction Coupling

Tropomyosin i...

Question

Tropomyosin is found on myosin whereas, troponin is found on actin filament.

A

True

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B

False

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Solution

The correct option is B False
Troponin and tropomyosin are the integral proteins that are present on the actin filaments.
When the calcium ion binds to the troponin, tropomyosin frees the actin filament, so that myosin head can join actin. This results in the contraction of muscle.

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Similar questions

Actin binding sites are located on

(i) Myosin

(ii) Tropomyosin

(iii) Troponin

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).

Q. Read the statements regarding muscle proteins. Which of the following statement is correct?
(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 polymerised protein.
D) The globular head of meromyosin consists of light meromyosin (LMM).

Q. Describe the structure of actin and myosin filaments.

(The Length Sarcomere is

2.5 μ m (

= 1 μ m,)

= 1.5 μ m

1

Myosin filament &

1

Actin filament is surrounded by

3

Myosin filament.)

Q. One myosin filament in the myofibril of skeleton muscle fibres is surrounded by how many actin filaments.

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Excitation Contraction Coupling

Standard IX Biology

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