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Q. No.Which of the following leads to removal of masking of active sites for myosin during muscle contraction?
1. Binding of ATP to its site on myosin head
2. Binding of calcium with a subunit of troponin
3. Binding of acetylcholine to its receptor on sarcolemma
4. Release of acetylcholine by anterior motor neuron
Subtopic: Muscle Contraction: Other Considerations |
84%
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Consider the following two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
| I: | Repeated activation of muscles can lead to fatigue. |
| II: | Repeated activation of muscles can lead to accumulation of lactic acid. |
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
Subtopic: Excitation Contraction Coupling I |
87%
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All the following are examples of synovial joints in human body except:
| 1. | Gliding joint | 2. | Pivot joint |
| 3. | Sutures in cranium | 4. | Saddle joint |
Subtopic: Synovial Joint |
94%
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Flagellar movement helps in all the following except:
| 1. | the swimming of spermatozoa in humans |
| 2. | maintenance of water current in the canal system of sponges |
| 3. | locomotion of Protozoans like Euglena |
| 4. | movement of plasmodia in slime moulds |
Subtopic: Introduction to Locomotion |
77%
From NCERT
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Muscle:
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: | is a specialised tissue of endodermal origin. |
| II: | contributes about 20-30 per cent of the body weight of a human adult. |
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 |
80%
From NCERT
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Match the type of muscle given in Column I with correct description in Column II and select the correct match as your answer from the codes given:
Codes:
| COLUMN I | COLUMN II | ||
| A | Skeletal | P | Unstriated and Involuntary |
| B | Smooth | Q | Striated and Voluntary |
| C | Cardiac | R | Striated and Involuntary |
| A | B | C | |
| 1. | P | Q | R |
| 2. | R | Q | P |
| 3. | Q | P | R |
| 4. | P | R | Q |
Subtopic: Introduction to Locomotion |
94%
From NCERT
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The number of incorrectly matched pairs is/are:
1. 1
2. 2
3. 3
4. 4
| I: | Z line | an attachment point for actin molecules |
| II: | M line | an attachment point for myosin molecules |
| III: | A band | a band where only actin molecules are found |
| IV: | I band | a band where only myosin molecules are found |
1. 1
2. 2
3. 3
4. 4
Subtopic: Skeletal Muscle: Sarcomere |
72%
From NCERT
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Regarding the myosin protein:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | It is a polymerised protein. |
| II: | The HMM component is the the head and short arm. |
| III: | The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for actin. |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
83%
From NCERT
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During shortening of the muscle, i.e., contraction:
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 ‘I’ bands get reduced |
| II: | the ‘A’ bands retain the length |
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: Sarcomere | Muscle Contraction: Other Considerations |
90%
From NCERT
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The vertebral column is differentiated into:
1. Only I and II are correct
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
| I: | cervical region with 7 vertebrae |
| II: | thoracic region with 12 vertebrae (12) |
| III: | lumbar region with 4 vertebrae |
| IV: | sacral (2-fused) and coccygeal (2-fused) regions |
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
Subtopic: Axial Skeleton |
93%
From NCERT
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