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
At which stage of the cell cycle does DNA replication occur:
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
The cells of the quiescent centre are characterised by:
1. Having dense cytoplasm and prominent nuclei
2. Having light cytoplasm and small nuclei
3. Dividing regularly to add to the corpus
4. Dividing regularly to add to tunica
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 |
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