Q. No.If you are provided with 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
At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?
1. During telophase
2. During S-phase
3. During G2 stage of prophase
4. During entire prophase
Four healthy people in their 20s got involved in injuries resulting in damage and death of a few cells. Which of the following cells are least likely to be replaced by new cells ?
1. Osteocytes
2. Liver cells
3. Neurons
4. Malpighian layer of the skin
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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Synapsis occurs between
1. mRNA and ribosomes
2. Spindle fibers and centromere
3. Two homologous chromosomes
4. A male and a female gamete
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During mitosis, endoplasmic reticulum and nucleolus begin to disappear at:
| 1. | Late metaphase | 2. | Early prophase |
| 3. | Late prophase | 4. | Early metaphase |
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Which stages of cell division do the following figures A and B represent respectively?
1. Metaphase - Telophase
2. Telophase - Metaphase
3. Late anaphase – Prophase
4. Prophase – Anaphase
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Identify the meiotic stage in which the homologous chromomes separate while the sister chromatids remain associated at their centromeres:
| 1. | Anaphase I | 2. | Anaphase II |
| 3. | Metaphase I | 4. | Metaphase II |
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The complex formed by a pair of synapsed homologous chromosomes is called
| 1. | Equatorial plate | 2. | Kinetochore |
| 3. | Bivalent | 4. | Axoneme |
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A stage in cell division is shown in the figure. Select the answer which gives the correct identification of the stage with its characteristics.
| Stages | Description | |
| 1. | Telophase | Nuclear envelop reforms, Golgi complex reforms |
| 2. | Late anaphase | Chromosomes move away from equatorial plate, Golgi complex not present |
| 3. | Cytokinesis | Cell plate formed, mitochondria distributed between two daughter cells |
| 4. | Telophase | Endoplasmic reticulum and nucleolus not reformed yet |
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