Q. No.Identify the human cell for which the interphase period lasts the entire life of a person.
1.
Hepatocyte
2.
Bone marrow stem cells
3.
Epidermal cell
4.
Neuron
Consider the following functions:
| I: | Replication of DNA along with the synthesis of nuclear proteins such as histones |
| II: | Duplication of centriole |
| III: | Synthesis of energy rich compounds and proteins |
Which of the above functions are carried out by a plant cell before it divides?
| 1. | I only | 2. | I, and II |
| 3. | I and III | 4. | I, II and III |
The duration of which of the following is constant in most cell types?
1. G1 phase, S phase and G2 phase
2. S phase, M phase and G1 phase
3. S phase, G2 phase and M phase
4. G1 phase, M phase and G2 phase
Consider the following statements:
| I: | G0 phase is viewed as either an extended G1 phase where the cell is neither dividing nor preparing to divide or as a distinct quiescent stage which occurs outside of the cell cycle. |
| II: | In gamete production interphase is succeeded by meiosis. |
| III: | In programmed cell death interphase is followed or preempted by apoptosis. |
The correct statements include:
| 1. | II and III | 2. | I and III |
| 3. | I, II, and III | 4. | I only |
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Cyclins and cyclin-dependent kinases (CDKs) are:
1. Two key classes of regulatory molecules that determine a cell's progress through the cell cycle
2. The products of the proto-oncogenes in a eukaryotic cell
3. Two very important promoters that are involved in oncogenes
4. Mediators of apoptosis
Consider the following statements:
| I: | In animals, meiosis always results in the formation of gametes, while in other organisms it can give rise to spores. |
| II: | Meiosis is essential for sexual reproduction and therefore occurs in all eukaryotes (including single-celled organisms) that reproduce sexually. |
| III: | Meiosis does not occur in archaea or bacteria, which reproduce via asexual processes such as binary fission. |
The correct statements are:
1. I, II, and III
2. II and III
3. I and III
4. I and II
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Which of the following statements is NOT true of mitosis?
| 1. | A single nucleus gives rise to two identical daughter nuclei. |
| 2. | The daughter nuclei are genetically identical to the parent nucleus. |
| 3. | The centromeres divide at the onset of anaphase. |
| 4. | Homologous chromosomes synapse in prophase. |
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In oocytes, the diplotene can last for months or years, since at this stage:
1. DNA proof reading and excision repair is performed
2. The proteins for metabolism are re-formed
3. The chromosomes condense and engage in RNA synthesis
4. The cell is temporarily withdrawn from the cell cycle
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A ribbon-like structure consisting of three protein components and extending across the region of synapsed chromosomes during the prophase of meiosis, is called:
| 1. | Phragmoplast | 2. | Phragmosome |
| 3. | Synaptonemal complex | 4. | Recombination nodule |
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The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over is called:
| 1. | Centromere | 2. | Centrosome |
| 3. | Chiasmata | 4. | Tetrad |
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