- 1(current)
Q. No.A motor neuron along with all the muscle fibers innervated by it constitute a:
| 1. Fascicle | 2. Motor end plate |
| 3. Motor unit | 4. Myoneural junction |
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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 |
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A: I is the active site to which the head of myosin binds during muscle contraction.
B: II is the site for ATP molecule.
C: The head shown has an ATPase activity.
| 1. Only C | 2. Only A |
| 3. Only B and C | 4. A, B and C |
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Myosin myofilaments are
1. made up of thick and thin myofilaments.
2. found only in the H zone.
3. not seen in the H zone.
4. attached to filaments that form the M line.
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Identify the correct statement:
1. Tropomyosin is found in two forms – monomeric G and polymeric F.
2. The head of the myosin molecule binds to an active site on G actin.
3. ATPase is present in troponin A.
4. Actin molecules do not move during muscle contraction.
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1. It makes up the I band of the sarcomere and A is Troponin, B is Tropomyosin and C is F-actin
2. It makes up the A band of the sarcomere and A is Troponin, B is Tropomyosin and C is F-actin
3. It makes up the I band of the sarcomere and A is Calmodulin, B is Tropomyosin and C is G-actin
4. It makes up the A band of the sarcomere and A is Calmodulin, B is Tropomyosin and C is F-actin
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| Assertion (A): | Slow twitch fibers can sustain action for a long period of time without fatigue. |
| Reason (R): | They can respire anaerobically by using a large store of glycogen and high concentration of glycolytic enzymes. |
In the light of the above statements choose the correct answer from the options given below:
| 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. |
- 1(current)
Q. No.
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