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
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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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.
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 |
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) |
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 |
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 |
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 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
When a cell is preparing for mitosis, it is said to be in which phase of the cell cycle?
| 1. | G1 | 2. | G0 |
| 3. | S | 4. | G2 |
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