- 1(current)
Q. No.| a. | ‘H’ zone decreases in length and disappears on full relaxation |
| b. | A band remains unchanged |
| c. | I band gets reduced in length due to decrease in length of actin filaments |
| d. | Myosin hydrolyses ATP, releasing ADP and P1 |
| e. | Z- lines move away from each other |
1. (a), (b), (c) and (d)
2. (a), (b), (d) and (e)
3. (a), (c) and (e)
4. (b) and (d)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| (a) | Binding of calcium with the subunit of tropomyosin removes the masking of active sites for myosin |
| (b) | Z-lines move towards the centre of ‘H’ zone |
| (c) | Cross bridge is formed by utilising the energy from hydrolysis of ATP |
| (d) | H-zone disappears when a muscle fibre is maximally contracted |
Select the option with the correct statement
1. a and c only
2. b and d only
3. a, c and d
4. b, c and d
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDuring 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyReason (R): Muscular contraction occurs by the sliding of thick filaments over the thin filaments.
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. Both (A) and (R) are false
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyReason (R): Sliding filament theory was introduced b Andrew Huxley, Rolf Niedergerke, Hugh Huxley and Jean Hanson.
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. Both (A) and (R) are false
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
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