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Q. No.Which stage of prophase I of meiosis I can last for months or years in oocytes of some vertebrates?
1. Zygotene
2. Pachytene
3. Diplotene
4. Diakinesis
Subtopic: Cell Cycle: Meiosis I |
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In contrast to meiosis I, meiosis II:
| 1. | is much lengthy in duration. |
| 2. | leads to reduction in the number of chromosomes. |
| 3. | is characterised by replication of DNA just before its beginning. |
| 4. | resembles a normal mitosis. |
Subtopic: Cell Cycle: Meiosis II |
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Duration of cell cycle can vary from:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | organism to organism |
| II: | from cell type to cell type in the same organism |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Intro to Cell Cycle & Interphase |
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At the end of the S phase in a typical eukaryotic cell cycle:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | the amount of DNA per cell doubles |
| II: | there is no increase in the chromosome number |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Intro to Cell Cycle & Interphase |
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Consider the given two statements:
| Assertion (A): | Meiosis is the mechanism by which conservation of specific chromosome number of each species is achieved across generations in sexually reproducing organisms. |
| Reason (R): | Cells in G0 stage no longer remain metabolically active and no longer proliferate unless called on to do so depending on the requirement of the organism. |
| 1. | (A) is True; (R) is False |
| 2. | Both (A) and (R) are True and (R) correctly explains (A) |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 4. | (A) is False; (R) is True |
Subtopic: Intro to Cell Cycle & Interphase | Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
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Consider the given two statements:
| Statement I: | With few exceptions, in animals, mitotic cell division is generally only seen in the diploid somatic cells. |
| Statement II: | The plants can show mitotic divisions in both haploid and diploid cells. |
| 1. | Statement I is incorrect; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is correct; Statement II is correct |
Subtopic: Intro to Cell Cycle & Interphase |
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Consider the two given statements:
1. Statement I is incorrect; Statement II is incorrect
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is correct; Statement II is correct
| Statement I: | At the time of cytoplasmic division, organelles like mitochondria and plastids get distributed between the two daughter cells. |
| Statement II: | In some organisms karyokinesis is not followed by cytokinesis as a result of which multinucleate condition arises leading to the formation of syncytium (e.g., liquid endosperm in coconut). |
1. Statement I is incorrect; Statement II is incorrect
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is correct; Statement II is correct
Subtopic: Cell Division: Mitosis (Karyokinesis) | Cell Division: Mitosis (Cytokinesis) |
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How many of the given statements will correctly apply to the significance of mitosis?
| I: | Mitosis usually results in the production of diploid daughter cells with identical genetic complement. |
| II: | The growth of multicellular organisms is due to mitosis. |
| III: | It restores the nucleo-cytoplasmic ratio of a cell. |
| IV: | A very significant contribution of mitosis is cell repair. |
| V: | It replaces lost cells. |
| VI: | Mitotic divisions in the meristematic tissues – the apical and the lateral cambium, result in a continuous growth of plants throughout their life. |
| VII: | It creates genetic variation for acting as raw material for natural selection. |
| 1. | 4 | 2. | 5 |
| 3. | 6 | 4. | 7 |
Subtopic: Intro to Cell Cycle & Interphase | Cell Division: Mitosis (Karyokinesis) | Cell Division: Mitosis (Cytokinesis) |
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The stage between the two meiotic divisions is called:
| 1. | interkinesis and there is no replication of DNA during this stage. |
| 2. | interkinesis and there is replication of DNA during this stage. |
| 3. | interphase II and there is no replication of DNA during this stage. |
| 4. | interphase II and there is replication of DNA during this stage. |
Subtopic: Intro to Cell Cycle & Interphase | Cell Cycle: Meiosis I |
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During mitosis, the complete disintegration of the nuclear envelope marks the start of:
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
Subtopic: Cell Division: Mitosis (Karyokinesis) |
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