Q. No.At which stage of the cell cycle does DNA replication occur:
1. G1 - phase
2. S - phase
3. G2 - phase
4. M - phase
1. G1 - phase
2. S - phase
3. G2 - phase
4. M - phase
The best material for the study of mitosis in the laboratory:
1. Anther
2. Root tip
3. Leaf tip
4. Ovary
Spindle fiber unites with which structure of chromosomes:
1. Chromocenter
2. Chromomere
3. Kinetochore
4. Centriole
If you are provided with the 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 |
Amount of cellular DNA increases during:
| 1. | Cytokinesis | 2. | Fertilisation |
| 3. | Mutation | 4. | Respiration |
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. | \(G_2\) phase follows the mitotic phase |
| 4. | In the \(G_1\) phase, DNA content is double the amount of DNA present in the original cell |
Crossing over that results in genetic recombination in higher organisms occurs between:
1. Non-sister chromatids of a bivalent
2. Two daughter nuclei
3. Two different bivalents
4. Sister chromatids of a bivalent
Which of the following stages of meiosis involves division of centromere?
1. Anaphase II
2. Telophase II
3. Metaphase I
4. Metaphase II
Match List-I with List-II
| List-I | List-II | ||
| (a) | S phase | i. | Proteins are synthesized |
| (b) | G2 phase | ii. | Inactive phase |
| (c) | Quiescent stage | iii. | Interval between mitosis and initiation of DNA replication |
| (d) | G1 phase | iv. | DNA replication |
Choose the correct answer from the options given below:
| Options: | (a) | (b) | (c) | (d) |
| 1. | iv | i | ii | iii |
| 2. | ii | iv | iii | i |
| 3. | iii | ii | i | iv |
| 4. | iv | ii | iii | i |
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