Cell Cycle and Cell Division
- 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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In schematic break-up of the phases/ stages of cell cycle, D synthetic phase is the correct indication of the stage/phase in the cell cycle.
Correct Option: B
In schematic break-up of the phases/ stages of cell cycle, D synthetic phase is the correct indication of the stage/phase in the cell cycle.
- In ‘S’ phase of the cell cycle :
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During S or synthesis phase, replication or duplication of chromosomal DNA and synthesis of histone proteins takes place. During this time the amount of DNA per cell doubles.
Correct Option: A
During S or synthesis phase, replication or duplication of chromosomal DNA and synthesis of histone proteins takes place. During this time the amount of DNA per cell doubles.
- During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C?
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In M-phase both 4C and 2C of DNA are present in different stages.
Correct Option: C
In M-phase both 4C and 2C of DNA are present in different stages.
- A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has :
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When S-phase completes, a somatic cell contains 2n number of chromosomes and 4C content of DNA.
Correct Option: B
When S-phase completes, a somatic cell contains 2n number of chromosomes and 4C content of DNA.
- DNA replication in bacteria occurs :
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In bacteria DNA replication occurs in cytoplasm prior to fission. Prokaryotes due to their primitive nature do not show well marked S-phase.
Correct Option: B
In bacteria DNA replication occurs in cytoplasm prior to fission. Prokaryotes due to their primitive nature do not show well marked S-phase.
