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Q. No.A typical eukaryotic cell cycle is illustrated by human cells in culture. These cells divide once in:
1. about 90 minutes.
2. approximately every 24 hours.
3. nearly one week.
4. 120 days on an average.
Subtopic: Intro to Cell Cycle & Interphase |
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The number of correct statements from the given statements regarding cell division in human somatic cells will be:
1. 1
2. 2
3. 3
4. 4
| I: | The M Phase represents the phase when the actual cell division or mitosis occurs. |
| II: | The interphase represents the phase between two successive M phases. |
| III: | The interphase lasts more than 95% of the duration of cell cycle. |
| IV: | During interphase, the cell is metabolically not active. |
2. 2
3. 3
4. 4
Subtopic: Intro to Cell Cycle & Interphase |
83%
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In plant cells:
1. I is correct; II, III & IV are incorrect
2. I & IV are correct; II & III are incorrect
3. I & III are correct; II and IV are incorrect
4. All the statements: I, II, III & IV are correct.
| I: | during the S phase, DNA replication begins in the nucleus. |
| II: | during the S phase, the centriole duplicates in the cytoplasm. |
| III: | during the G2 phase, proteins are synthesised in preparation for mitosis |
| IV: | cell growth stops during S phase and G2 phase. |
2. I & IV are correct; II & III are incorrect
3. I & III are correct; II and IV are incorrect
4. All the statements: I, II, III & IV are correct.
Subtopic: Intro to Cell Cycle & Interphase |
63%
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Consider the given two statements:
| Statement I: | In male honeybees, haploid cells divide by mitosis. |
| Statement II: | Higher plants show mitotic divisions only in diploid cells. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is incorrect. |
| 3. | Statement I is correct and Statement II is correct. |
| 4. | Statement I is incorrect and Statement II is correct. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
57%
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Identify the incorrect statement regarding prophase stage of mitosis:
| 1. | It follows the G2 phases of interphase. |
| 2. | It is marked by the initiation of condensation of chromosomal material. |
| 3. | The centrosome undergoes duplication during this phase in animal cells. |
| 4. | By the end of this phase, chromosomes are seen to be composed of two chromatids attached together at the centromere. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
75%
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All the following events take place during the telophase stage of mitosis except:
| 1. | Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements. |
| 2. | Nuclear envelope develops around the chromosome clusters at each pole forming two daughter nuclei. |
| 3. | Nucleolus, Golgi complex and ER re-form. |
| 4. | Microtubules get organised into spindle fibres. |
Subtopic: Cell Division: Mitosis (Karyokinesis) |
84%
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All the following are key features of meiosis except:
| 1. | Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication. |
| 2. | Meiosis I is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase. |
| 3. | Meiosis involves pairing of homologous chromosomes and recombination between non-sister chromatids of homologous chromosomes. |
| 4. | Four haploid cells are formed at the end of meiosis I. |
Subtopic: Cell Cycle: Meiosis I |
72%
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What is incorrect regarding the second stage of prophase I?
| 1. | It is called Zygotene. |
| 2. | Chromosomes start pairing together and this process of association is called synapsis. |
| 3. | Such paired chromosomes are called heterologous chromosomes. |
| 4. | Chromosome synapsis is accompanied by the formation of complex structure called synaptonemal complex. |
Subtopic: Cell Cycle: Meiosis I |
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During which stage of prophase I of meiosis I, the four chromatids of each of the bivalent chromosomes
become distinct and clearly appear as tetrads?
become distinct and clearly appear as tetrads?
| 1. | Leptotene | 2. | Zygotene |
| 3. | Pachytene | 4. | Diplotene |
Subtopic: Cell Cycle: Meiosis I |
70%
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During prophase I of meiosis I, recombination between homologous chromosomes is completed:
1. in the Zygotene
2. in the beginning of the Pachytene
3. by the end of Pachytene
4. in the beginning of the Diplotene
1. in the Zygotene
2. in the beginning of the Pachytene
3. by the end of Pachytene
4. in the beginning of the Diplotene
Subtopic: Cell Cycle: Meiosis I |
73%
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