DNA replication occurs before a cell undergoes cell division.

CELL DIVISION AND CANCEROUS CELLS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	True
B	False

Explanation:

Detailed explanation-1: -Cells must replicate their DNA before they can divide. This ensures that each daughter cell gets a copy of the genome, and therefore, successful inheritance of genetic traits. DNA replication is an essential process and the basic mechanism is conserved in all organisms.

Detailed explanation-2: -The first step in DNA replication is to ‘unzip’ the double helix structure of the DNA? molecule. This is carried out by an enzyme? called helicase which breaks the hydrogen bonds? holding the complementary? bases? of DNA together (A with T, C with G).

Detailed explanation-3: -Further, DNA can only be produced with a template, so the replication must occur before division. This occurs in the S phase of interphase and is an important milestone for the cell cycle to continue.

Detailed explanation-4: -In eukaryotes, the cell cycle consists of four discrete phases: G1, S, G2, and M. The S or synthesis phase is when DNA replication occurs, and the M or mitosis phase is when the cell actually divides.

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