Q. No.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 is increased
4. amount of DNA is reduced to half in each cell.
1. amount of DNA doubles in each cell.
2. amount of DNA remains same in each cell.
3. chromosome number is increased
4. amount of DNA is reduced to half in each cell.
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Spindle fibres attach on to:
1. Kinetosome of the chromosome
2. Telomere of the chromosome
3. Kinetochore of the chromosome
4. Centromere of the chromosome
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A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in
| 1. | Polyteny | 2. | Aneuploidy |
| 3. | Polyploidy | 4. | Somaclonal variation |
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Identify the human cell for which the interphase period lasts the entire life of a person.
1. Hepatocyte
2. Bone marrow stem cells
3. Epidermal cell
4. Neuron
Consider the following functions:
I. Replication of DNA along with the synthesis of nuclear proteins such as histones
II. Duplication of centriole
III. Synthesis of energy rich compounds and proteins
Which of the above functions are carried out by a plant cells before it divides?
1. I only
2. I, and II
3. I and III
4. I, II, and III
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The duration of which of the following is constant in most cell types?
1. G1 phase, S phase and G2 phase
2. S phase, M phase and G1 phase
3. S phase, G2 phase and M phase
4. G1 phase, M phase and G2 phase
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Which of the following statements is NOT true of mitosis?
1. A single nucleus gives rise to two identical daughter nuclei.
2. The daughter nuclei are genetically identical to the parent nucleus.
3. The centromeres divide at the onset of anaphase.
4. Homologous chromosomes synapse in prophase.
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In oocytes, the diplotene can last for months or years, since at this stage:
1. DNA proof reading and excision repair is performed
2. The proteins for metabolism are re-formed
3. The chromosomes condense and engage in RNA synthesis
4. The cell is temporarily withdrawn from the cell cycle
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