Q. No.The fruit fly has 8 chromosomes (2n) in each cell. During the interphase of mitosis, if the number of chromosomes at G1 phase is 8, what would be the number of chromosomes after the S phase?
| 1. | 4 | 2. | 32 |
| 3. | 8 | 4. | 16 |
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 |
Match the following events that occur in their respective phases of cell cycle and select the correct option
| (a) | G1 phase | (i) | Cell grows and organelle duplication |
| (b) | S phase | (ii) | DNA replication and chromosome duplication |
| (c) | G2 phase | (iii) | Cytoplasmic growth |
| (d) | Metaphase in M-phase | (iv) | Alignment of chromosomes |
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (iv) | (i) | (ii) | (iii) |
| 4. | (i) | (ii) | (iii) | (iv) |
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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Some dividing cells exit the cell cycle and enter the vegetative inactive stage. This is called the quiescent stage G0. This process occurs at the end of:
| 1. | G1 phase | 2. | S phase |
| 3. | G2 phase | 4. | M phase |
Identify the correct statement with regard to phase (Gap 1) of interphase.
1. The reorganisation of all cell components takes place.
2. The cell is metabolically active, grows but does not replicate its DNA
3. Nuclear division takes place
4. DNA synthesis or replication takes place.
| 1. | The chromosome number and DNA content remain 2N and 2C respectively |
| 2. | The chromosome number and DNA content are 4N and 2C respectively |
| 3. | The chromosome number and DNA content are 2N and 4C respectively |
| 4. | The chromosome number and DNA content are 4N and 4C respectively |
A point in the animal cell cycle, at which the cell becomes "committed" to the cell cycle, occurs in:
| 1. | G1 phase | 2. | S phase |
| 3. | G2 phase | 4. | M phase |
Consider the following two statements:
I. The growth of multi-cellular organisms is due to mitosis.
II. Mitosis results in the production of diploid daughter cells with identical genetic complement usually.
Of the two statements:
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
What is the number of phases in the cell cycle of a typical eukaryotic cell?
| 1. | 4 | 2. | 5 |
| 3. | 3 | 4. | 2 |
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