Q. No.What is correct?
1. DNA content becomes double during G1- phase
2. Duration of interphase is short as compared to M-phase
3. G2-phase follows mitotic phase
4. DNA-replication occurs in S-phase
What precedes reformation of nuclear envelope in M-phase?
1. Decondensation of chromosomes and appearance of nuclear lamina.
2. Transcription of chromosomes and reassembly of phragmoplast.
3. Formation of phragmoplast and contraction ring.
4. Formation of contraction ring and transcription from chromosome.
Centromere is required for
1. Crossing over
2. Transcription
3. Cytoplasmic cleavage
4. Movement of chromosomes towards poles
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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 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
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