Question
Biology Question on cell cycle and cell division
In a somatic cell cycle, DNA synthesis takes place in
A
G| phase
B
prophase of mitosis ;
C
S-phase
D
G2 phase.
Answer
S-phase
Explanation
Solution
Interphase is the stage between two successive cell divisions. During interphase, chromosomes are decondensed and are distributed throughout the nucleus. It is the largest period in the cell cycle and is divided into three phase - G1 S and G2. During G1 phase the cell grows and synthesis of tRNA, mRNA, ribosomes, enzymes and proteins necessary for DNA synthesis occurs. During S phase replication of DNA takes place. The nucleotides get assembled and DNA molecules are synthesized. During G2 phase organelles like centrioles are doubled and mitochondria, chloroplasts etc. divide.