Question

During cell growth, DNA synthesis takes place in
A) G2 phase
B) M phase
C) S phase
D) G1 phase

Answer 1

Cell growth is a process by which cells proliferate leading to production of increased number of cells through the process of cell division. The cell division is a process that is highly regulated in cells because unregulated cell growth may lead to the formation of tumours which can lead to cancer in the future.

Complete answer:
Before undergoing cell division the cells go through different stages to make sure that they are ready to divide. Cell division is the process during which a parent cell divides to form two identical daughter cells. It is important that the two daughter cells receive the same genetic material from their parents. The cell division is a part of the cell cycle which comprises a total of four stages. The first stage is G1 where the cell increases in size and ensures it has everything ready to undergo DNA replication. The second is the S phase during which the DNA replication occurs. The third is the G2 phase which ensures that the DNA has replicated properly and the cell is ready to divide. The last stage is the M phase where the parent cell divides into two identical daughter cells. The first three stages together are called the interphase and are the longest part of the cell cycle.

So the correct answer is option (C).

Note: Cell cycle is very crucial for the survival of a cell and so it is tightly regulated and once a cell commits to undergo cell cycle it is impossible to reverse it.