- 1(current)
Q. No.Consider the given two statements:
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
| Statement I: | Thick filaments within the myofibril are composed primarily of actin. |
| Statement II: | Thin filaments within the myofibril are composed primarily of myosin. |
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%
From NCERT
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The number of correct statements from the statements given below will be:
| I: | The striated appearance of skeletal muscle myofibril is due to the distribution pattern of two important proteins – Actin and Myosin. |
| II: | The light band contains actin and is called as I-band or Isotropic band. |
| III: | Actin and myosin in a myofibril are arranged as rod-like structures, parallel to each other and also to the longitudinal axis of the myofibrils. |
| IV: | Actin filaments are thinner as compared to the myosin filaments. |
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
84%
From NCERT
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Regarding the ultra-structure of a sarcomere, the Z line corresponds to:
| 1. | a band where only actin molecules are found |
| 2. | a band where only myosin molecules are found |
| 3. | an attachment point for actin molecules |
| 4. | an attachment point for myosin molecules |
Subtopic: Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
78%
From NCERT
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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 |
75%
From NCERT
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Consider the following statements:
| I: | The head of myosin is made of LMM and the tail is made of HMM |
| II: | F Actin is monomeric while G actin is polymeric |
| III: | Tropomyosin is composed of three globular proteins |
The incorrect statements are:
| 1. I and II only | 2. I and III only |
| 3. II and III only | 4. I, II and III |
Subtopic: Skeletal Muscle: Myofilaments |
61%
From NCERT
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
Consider the given two statements:
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
| Statement I: | A single filament of tropomyosin runs close to the ‘F’ actins throughout its length. |
| Statement II: | In the resting state, a subunit of troponin masks the active binding sites for myosin on the actin filaments. |
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: Myofilaments |
From NCERT
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The head of the myosin myofilament has sites for:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | binding to active sites on actin myofilaments |
| II: | binding to ADP |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Skeletal Muscle: Myofilaments |
70%
From NCERT
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The number of correct statement(s) from the given statements is/are:
1. 0
2. 1
3. 2
3. 3
| I: | Myoglobin content is very low in the red fibres. |
| II: | white muscle fibers contain plenty of mitochondria. |
| III: | The amount of sarcoplasmic reticulum is high in red muscle fibers. |
| IV: | White muscle fibres depend on anaerobic process for energy. |
2. 1
3. 2
3. 3
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
71%
From NCERT
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What is a key difference between red muscle fibers and white muscle fibers?
| 1. | Red muscle fibers are adapted for endurance and have a high myoglobin content, while white muscle fibers are designed for short bursts of activity and contain less myoglobin. |
| 2. | White muscle fibers are rich in myoglobin, whereas red muscle fibers are not. |
| 3. | Red muscle fibers are smaller in diameter than white muscle fibers. |
| 4. | White muscle fibers have more mitochondria than red muscle fibers. |
Subtopic: Skeletal Muscle: Myofilaments |
95%
From NCERT
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