Q. No.The critical event for the contraction of striated muscles would be that calcium ions:
1. are released from troponin C
2. bind to tropomyosin
3. bind to troponin
4. are taken up by the sarcoplasmic reticulum
1. are released from troponin C
2. bind to tropomyosin
3. bind to troponin
4. are taken up by the sarcoplasmic reticulum
Identify the correct statement regarding the use of ATP in muscle contraction:
1. ATP cannot be directly used for muscle contraction.
2. ATP is not required for muscle relaxation.
3. When ATP is hydrolyzed, the conformation of myosin is changed.
4. Once the cross-bridge is formed, the hydrolysis of ATP initiates the power stroke.
Identify the correct statement regarding human ribs:
1. The true ribs attach directly to the sternum with costal cartilage.
2. Floating ribs do not have any attachments.
3. The human ribs are tricephalic.
4. Vertebrochondral ribs are classified as true ribs.
Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
| 1. | Calcium | 2. | Magnesium |
| 3. | Sodium | 4. | Potassium |
The globular head of the myosin filament has active site/s for binding to:
I. ATP
II. Active site on actin filament
III. Calcium
| 1. | Only I | 2. | Only I and II |
| 3. | Only II and III | 4. | I, II and III |
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The phosphogen that helps the regeneration of ATP from ADP during muscle contraction in vertebrates is
| 1. | ADP | 2. | Inosital phosphate |
| 3. | Arginine phosphate | 4. | Creatine phosphate |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Smooth muscle is fundamentally different from skeletal muscle and cardiac muscle. |
| Reason (R): | Smooth muscle is an involuntary non-striated muscle. |
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. |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Within the A-band of a sarcomere is a paler region called the H-zone. |
| Reason (R): | H-zone is the zone of the thin myofilaments in the center of the A band. |
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. |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Hydrolysis of ATP by myosin head is critical for the cross bridge formation. |
| Reason (R): | Myosin head has ATPase activity dependent on magnesium ions |
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. |
Skeletal muscles appear striated due to presence of two characteristic proteins in alternating dark and light bands. Which of the following is a correct match of the protein with its light refractive property and colour?
| Protein | Colour | Property | |
| 1. | Myosin | Light | Anisotropic |
| 2. | Actin | Dark | Anisotropic |
| 3. | Myosin | Dark | Isotropic |
| 4. | Actin | Light | Isotropic |
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