Q. No.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
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
Four healthy people in their 20s got involved in injuries resulting in damage and death of a few cells. Which of the following cells are least likely to be replaced by new cells ?
1. Osteocytes
2. Liver cells
3. Neurons
4. Malpighian layer of the skin
Given below is a schematic break-up of the phases/stages of cell cycle. Which one of the following is the correct indication of the stage/phase in the cell cycle?
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Synapsis occurs between
1. mRNA and ribosomes
2. Spindle fibers and centromere
3. Two homologous chromosomes
4. A male and a female gamete
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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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