Q. No.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
| 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 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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A bacterium divides every 35 minutes. If a culture containing 105 cells per mL is grown for 175 minutes, what will be the cell concentration per mL after 175 minutes ?
1. 175 × 105 cells
2. 85 × 105 cells
3. 35 × 105 cells
4. 32 × 105 cells
Best material for the study of mitosis in laboratory is
1. anther
2. root tip
3. leaf tip
4. ovary
In the somatic cell cycle,
1. DNA replication takes place in S-phase
2. A short interphase is followed by a long mitotic phase
3. G2 phase follows mitotic phase
4. In G1 phase, DNA content is double the amount of DNA present in the original cell
If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?
| 1. | Telophase | 2. | Anaphase |
| 3. | Prophase | 4. | Metaphase |
At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?
1. During telophase
2. During S-phase
3. During G2 stage of prophase
4. During entire prophase
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