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Myosin Molecule

Myosin filame...

Question

Myosin filaments are localized in

A

Z-Band

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B

H-Band

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C

A-Band

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D

None of the above

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Solution

The correct option is C A-Band
Each myofibril (muscle filament)has alternate dark and light bands on it.
The light bands contain actin and are called I-band or Isotropic band, whereas the dark band called ‘A’ or Anisotropic band contains Myosin.
Myosin filaments are also called as Thick filaments.
Hence Myosin filaments are localized in A-Band.
So, the correct answer is 'A-Band'.

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Similar questions

Q. Assess the statements.
1. A-bands of the muscle is dark and contain myosin.
2. I-bands are the light bands and contain actin.
3. During muscle contraction the A-band contracts.
4. The part between the two Z-lines is called as sarcomere.
5. The central part of thick filament, not overlapped by thin filament, called H-zone.
Of the above statements.

Q. Choose the option having all the correct statements:
I. Thin and thick filaments consist of myosin and actin, respectively.
II. The H-zone and I-band consists of only myosin and actin, respectively.
III. A-band contains both actin and myosin.
IV. M-line and Z-line are in the middle of thin and thick filaments, respectively.

Q. Value based questions.
Explain how any change in the A, H and I band lengths are brought about in terms of what happens to the actin and myosin filaments.

Q. In the transverse section of myofibril, the region of A band where thick and thin filaments overlap, each actin filament is surrounded by __(A)__thick filaments and each myosin filament is surrounded by __(B)__ thin filaments.

Q. Identify the correct statements.

1. A-bands are dark and contain myosin.
2. I-bands are light and contain actin.
3. During the action, A band contracts.
4. The part between two Z-lines is sarcomere.
5. The central part of thin filament, not overlapped by thick filament is the H-zone.

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