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
© 2024 GoodEd Technologies Pvt. Ltd.