Which statements are correct regarding centriole?
I: | Centrioles are typically made up of nine sets of short microtubule triplets, arranged in a cylinder. |
II: | The main function of centrioles is to produce cilia during interphase and the aster and the spindle during cell division. |
III: | Centrioles start duplicating when DNA replicates. |
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
Identify the incorrectly matched pair:
1. | Primary constriction | Satellite chromosome |
2. | Cilia/flagella | 9 + 2 arrangement of microtubules |
3. | Centriole | 9 + 0 arrangement of microtubules |
4. | Lysosomes | Acid hydrolases |
Consider the two statements:
I: | Spindle formation does not occur in plant cells during mitosis |
II: | Plant cells lack centrosomes |
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
Assertion (A): | Some infections with gram-negative bacteria can lead to life-threatening septic shock. |
Reason (R): | Lipopolysaccharide layer in gram-negative bacteria can trigger an innate immune response. |
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. |
Assertion (A): | The membranes of chloroplasts and mitochondria are not included in the endomembrane system of a eukaryotic cell. |
Reason (R): | The presence of chloroplasts and mitochondria in eukaryotic cells is explained by endosymbiosis. |
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. | 1 | 2. | 2 |
3. | 3 | 4. | 4 |
1. | Arrangement of axonemal microtubules in cilia and flagella is described as 9 + 2 |
2. | Arrangement of microtubules in centriole is described as 9 + 0 |
3. | Centrosome is involved in spindle formation in plant cell division |
4. | Centrioles form the basal body of cilia and flagella |
1. | Only I | 2. | Only II |
3. | Only II and III | 4. | Only III |
1. | Linus Pauling | Discovered the triple helix structure of collagen |
2. | Rudolf Virchow | Omnis cellula-e-cellula |
3. | Singer and Nicholson | Fluid mosaic model |
4. | Georges Palade | First observed ribosome |