NTA Abhyas NEET2020BotanyCell Cycle and Cell DivisionPractice
Select the correct even from below that is most likely to occur during the three subphases of the interphase of the mitotic cell cycle.
Options
- ADuring G 1 phase, the cell is metabolically active and replicates its DNA.
- BDuring S phase, duplication of centrioles takes place.
- CThe number of chromosomes becomes double in the synthesis phase.
- DReplication of DNA starts during the G 2 phase and proteins are synthesized in order to prepare the cell for m
Correct answer
B. During S phase, duplication of centrioles takes place.
Step-by-step solution
Interphase can be subdivided into 3 further phase: G 1 , S and G 2 . G 1 phase corresponds to the interval between mitosis and initiation of DNA replication. During G 1 phase the cell is metabolically active and continuously grows but does not replicate its DNA. S or synthesis phase marks the period during which DNA synthesis or replication takes place. During this time the amount of DNA per cell doubles. If the initial amount of DNA is denoted as 2C then it increases to 4C. However, there is no increase in the chr