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Q. No.The protein complex responsible for the automatic resetting of myosin heads [breaking of cross-bridge] during muscle contraction involves ATP binding to:
1. Actin
2. Myosin
3. Tropomyosin
4. Troponin
Subtopic: Skeletal Muscle: Myofilaments |
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Which statement is true regarding the types of ribs in humans?
| 1. | All ribs are connected directly to the sternum. |
| 2. | True ribs connect directly to the sternum via their own costal cartilages, while false ribs share cartilages. |
| 3. | All ribs are termed false ribs because they do not attach to the sternum. |
| 4. | Floating ribs are attached to the vertebral column only and do not have any cartilage. |
Subtopic: Sternum & Ribs |
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What are the sequential steps in the formation and breakage of a cross-bridge in muscle contraction?
| 1. | Myosin head hydrolyzes ATP, attaches to actin, performs a power stroke, and releases ADP. |
| 2. | Myosin head binds to ATP, detaches from actin, hydrolyzes ATP, and reattaches to actin. |
| 3. | Myosin head releases ADP, binds to ATP, detaches from actin, and hydrolyzes ATP. |
| 4. | Myosin head attaches to actin, performs a power stroke, binds ATP, and then detaches from actin. |
Subtopic: Sliding Filament Theory |
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The pubic symphysis in the pelvic girdle is structurally significant because it:
| 1. | Contains fibrous cartilage allowing slight movement |
| 2. | Contains dense fibrous connective tissue for full immobility |
| 3. | Contains synovial fluid for greater flexibility |
| 4. | Directly connects the femur with the pelvis |
Subtopic: Appendicular Skeleton: Girdle |
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A motor neuron along with the muscle fibers connected to it constitute:
1. a neuromuscular junction
2. a motor unit
3. a syncytium
4. a fascicle
1. a neuromuscular junction
2. a motor unit
3. a syncytium
4. a fascicle
Subtopic: Muscle Contraction: Other Considerations |
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Red muscle fibres when compared to the white muscle fibres have a higher:
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: | number of mitochondria |
| II: | number of blood capillaries |
| III: | myoglobin content |
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
Subtopic: Skeletal Muscle: Sarcomere |
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| Assertion(A): | Red muscle fibres are adapted to sudden outburst of muscular activity. |
| Reason(R): | Red muscle fibres are extremely rich in sarcoplasmic reticulum. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False and (R) is False. |
Subtopic: Muscle Contraction: Other Considerations |
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A motor unit is composed of:
| 1. | a motor neuron and all of the skeletal muscle fibers innervated by the neuron's axon terminals. |
| 2. | all motor neurons and all of the skeletal muscle fibers innervated by them in a muscle. |
| 3. | a motor neuron and one skeletal muscle fiber innervated by the neuron. |
| 4. | a motor neuron and a sensory neuron. |
Subtopic: Sliding Filament Theory | Muscle Contraction: Other Considerations |
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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: | Each ‘G’ [globular] actin is a polymer of monomeric ‘F’ actins. |
| Statement II: | The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for actin. |
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: Myofilaments |
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How many of the given pairs are correctly matched:
1. 2
2. 3
3. 4
4. 5
| I: | Ball and socket joint | Between humerus and pectoral girdle |
| II: | Hinge joint | Knee joint |
| III: | Pivot joint | Between atlas and occipital bone |
| IV: | Gliding joint | Between the carpals |
| V: | Saddle joint | Between carpal and metacarpal of thumb |
1. 2
2. 3
3. 4
4. 5
Subtopic: Synovial Joint |
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