Q. No.Synthesis of histone proteins occurs during:
1.
S-phase of the cell cycle.
2.
G1-phase of the cell cycle.
3.
G2-phase of the cell cycle.
4.
M-phase of the cell cycle.
In G1 phase, a meiocyte has 2N chromosome content and 2C DNA content. The chromosome and DNA content in each cell at the end of first meiotic division would be:
| 1. | 1N; 1C | 2. | 1N; 2C |
| 3. | 2N; 4C | 4. | 2N; 2C |
Consider the given two statements:
| I. | Sex chromosomes in male mammals also undergo synapsis in meiosis I |
| II. | Sex chromosomes are homologous chromosomes |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and are correct but II does not explain I |
| 3. | I is correct and II is incorrect |
| 4. | Both I and II are incorrect |
Apart from tissue stem cells, which of the following cells in the human body are good examples of being in reversible G0 phase?
| 1. | Mature hepatocytes |
| 2. | Senescent cells |
| 3. | Differentiated muscle |
| 4. | Differentiated bone |
Preprophase is an additional phase during mitosis in:
1. Animal cells
2. Plant cells
3. Fungal cells
4. Bacterial cells
In G1 phase, a cell has 2N chromosome content and 2C DNA content. The chromosome and DNA content at the end of S phase in this cell would be:
| 1. 1N; 1C | 2. 2N; 2C |
| 3. 2N; 4C | 4. 4N; 4C |
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If an organisms lives in an environment that increases the risk of damage to chromosomes, which of the following would be beneficial?
| 1. | Development of gametes into individuals without fertilization |
| 2. | Reproduction by binary fission |
| 3. | Syngamy |
| 4. | A life cycle excluding meiosis |
The main events of prophase include all the following except:
| 1. | the condensation of chromosomes |
| 2. | the replication of the centrosomes |
| 3. | the formation of the mitotic spindle |
| 4. | the beginning of nucleoli break down |
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Large protein complexes on the synaptonemal complex between two synapsed homologous chromosomes are called as:
| 1. | Kinetochore | 2. | Chiasmata |
| 3. | Recombination nodules | 4. | Telomeres |
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Anaphase is characterized by two distinct motions. The second motion, anaphase B:
| 1. | moves chromosomes to either pole of a dividing cell and this movement is primarily generated by the action of kinetochore microtubules. |
| 2. | moves chromosomes to either pole of a dividing cell and this movement is primarily generated by the action of interpolar microtubules. |
| 3. | involves the separation of the two poles from each other and the movement for this is primarily generated by the action of kinetochore microtubules. |
| 4. | involves the separation of the two poles from each other and the movement for this is primarily generated by the action of interpolar microtubules. |
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