- 1(current)
Q. No.Consider the given two statements:
| Statement I: | Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other. |
| Statement II: | Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
92%
Level 1: 80%+
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Consider the given two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | The unit in a myofibril from Z line to Z line is a sarcomere. |
| II: | A muscle motor unit includes one motor nerve fiber and all the muscle fibers innervated by it. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
79%
Level 2: 60%+
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Match the terms related to muscle contraction in Column-A with their descriptions or associated terms in Column-B:
Codes:
| Column-A | Column-B | ||
| A. | Myosin | P. | Blocks the active sites on actin filaments in a relaxed muscle |
| B. | Actin | Q. | Binds to troponin, causing the troponin to change shape and move tropomyosin away from the active sites |
| C. | Tropomyosin | R. | Thin filaments that slide past myosin during muscle contraction |
| D. | Calcium ions | S. | Thick filaments that pull on actin filaments to shorten the muscle |
Codes:
| A | B | C | D | |
| 1. | S | R | P | Q |
| 2. | S | R | Q | P |
| 3. | P | Q | R | S |
| 4. | P | Q | S | R |
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments |
83%
Level 1: 80%+
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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 |
85%
Level 1: 80%+
Hints
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 |
86%
Level 1: 80%+
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- 1(current)
Q. No.
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