Q. No.During mitosis, endoplasmic reticulum and nucleolus begin to disappear at:
1.
Late metaphase
2.
Early prophase
3.
Late prophase
4.
Early metaphase
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Which stages of cell division do the following figures A and B represent respectively?
1. Metaphase - Telophase
2. Telophase - Metaphase
3. Late anaphase – Prophase
4. Prophase – Anaphase
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Identify the meiotic stage in which the homologous chromomes separate while the sister chromatids remain associated at their centromeres:
| 1. | Anaphase I | 2. | Anaphase II |
| 3. | Metaphase I | 4. | Metaphase II |
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The complex formed by a pair of synapsed homologous chromosomes is called
| 1. | Equatorial plate | 2. | Kinetochore |
| 3. | Bivalent | 4. | Axoneme |
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A stage in cell division is shown in the figure. Select the answer which gives the correct identification of the stage with its characteristics.
| Stages | Description | |
| 1. | Telophase | Nuclear envelop reforms, Golgi complex reforms |
| 2. | Late anaphase | Chromosomes move away from equatorial plate, Golgi complex not present |
| 3. | Cytokinesis | Cell plate formed, mitochondria distributed between two daughter cells |
| 4. | Telophase | Endoplasmic reticulum and nucleolus not reformed yet |
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The enzyme recombinase is required at which stage of meiosis ?
| 1. | Pachytene | 2. | Zygotene |
| 3. | Diplotene | 4. | Diakinesis |
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During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C ?
1. G0 and G1
2. G1 and S
3. Only G2
4. G2 and M
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In S phase of the cell cycle
1. Amount of DNA doubles in each cell
2. Amount of DNA remains same in each cell
3. Chromosome number increases
4. Amount of DNA is reduced to half in each cell
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Arrange the following events of meiosis in correct sequence
(a) Crossing over
(b) Synapsis
(c) Terminalisation of chiasmata
(d) Disappearance of nucleolus
| 1. | (b), (c), (d), (a) | 2. | (b), (a), (d), (c) |
| 3. | (b), (a), (c), (d) | 4. | (a), (b), (c), (d) |
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A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has
| 1. | Twice the number of chromosomes and twice the amount of DNA |
| 2. | Same number of chromosomes but twice the amount of DNA |
| 3. | Twice the number of chromosomes and four times the amount of DNA |
| 4. | Four times the number of chromosomes and twice the amount of DNA |
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