Skeletal muscles appear striated due to presence of two characteristic proteins in alternating dark and light bands. Which of the following is a correct match of the protein with its light refractive property and colour?

Protein Colour Property
1. Myosin  Light Anisotropic
2. Actin  Dark   Anisotropic
3. Myosin Dark Isotropic
4. Actin  Light  Isotropic
Subtopic:  Skeletal Muscle: Myofilaments |
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During muscular contraction, which of the following events occur?
(a) 'H' zone disappears
(b) 'A' band widens
(c) 'I' band reduces in width
(d) Myosin hydrolyzes ATP, releasing the ADP and Pi
(e) Z-lines attached to actins are pulled inwards

Choose the correct answer from the options given below.
1. (b), (c), (d), (e) only
2. (b), (d), (e), (a) only
3. (a), (c), (d), (e) only
4. (a), (b), (c), (d) only

Subtopic:  Skeletal Muscle: Myofilaments | Sliding Filament Theory |
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The globular head of the myosin filament has active site/s for binding to:
I. ATP
II. Active site on actin filament
III. Calcium

1. Only I 2. Only I and II
3. Only II and III 4. I, II and III
Subtopic:  Skeletal Muscle: Myofilaments |
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Identify the incorrect statement regarding the ultra-structure of a skeletal muscle:
1. Z lines bisect the I band
2. G actin is a polymer of F actins
3. A subunit of troponin masks active binding sites for myosin on the actin filament.
4. Globular head of myosin has ATPase activity.
Subtopic:  Skeletal Muscle: Myofilaments |
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The structure shown in the given diagram is a:

1. Muscle fibre
2. Myofibril
3. Myofilament
4. Myoblasts

Subtopic:  Skeletal Muscle: Myofilaments |
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