Q. No.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
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.
Consider the given two statements:
I. The kinetochore is essential for the chromosome segregation that is classically associated with mitosis and meiosis.
II. The kinetochore assembles on the centromere and links the chromosome to microtubule polymers from the mitotic spindle during mitosis and meiosis.
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
The components of nuclear envelope are dismantled during:
| 1. | prophase and reconstructed during telophase |
| 2. | prophase and reconstructed during anaphase |
| 3. | metaphase and reconstructed during telophase |
| 4. | metaphase and reconstructed during anaphase |
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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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Preprophase is an additional phase during mitosis in:
1. Animal cells
2. Plant cells
3. Fungal cells
4. Bacterial cells
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
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
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