Q. No.Centromere is required for:
1.
Movement of chromosomes toward poles
2.
Cytoplasmic cleavage
3.
Crossing over
4.
Transcription
At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell:
| 1. | During telophase |
| 2. | During S-phase |
| 3. | During the G-2 stage of prophase |
| 4. | During the entire prophase |
In S–phase, DNA is replicated in a medium containing radioactive thymidine. Radioactivity will be observed in:
| 1. | Euchromatin | 2. | Heterochromatin |
| 3. | Both | 4. | Nucleolus |
Which one of the following precedes the reformation of the nuclear envelope during the M phase of the cell cycle:
| 1. | Decondensation from chromosomes and reassembly of the nuclear lamina |
| 2. | Formation of the contractile ring and formation of the phragmoplast |
| 3. | Formation of the contractile ring and transcription from chromosomes |
| 4. | Transcription from chromosomes and reassembly of the nuclear lamina |
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
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 |
Amount of cellular DNA increases during:
| 1. | Cytokinesis | 2. | Fertilisation |
| 3. | Mutation | 4. | Respiration |
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 |
Spindle fiber unites with which structure of chromosomes:
1. Chromocenter
2. Chromomere
3. Kinetochore
4. Centriole
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