Questions: To understand DNA replication, we need to understand the "why." Why does DNA need to replicate before cells divide?

DNA replication is a crucial process that occurs before cell division, and understanding the "why" behind it involves several key points:

1. Genetic Continuity: DNA contains the genetic information necessary for the development, functioning, and reproduction of living organisms. For a cell to divide and produce two daughter cells, each new cell must have an identical copy of the DNA. This ensures that the genetic information is preserved and passed on accurately from one generation of cells to the next.

2. Cell Function and Identity: Each cell in an organism has a specific function and identity, which is determined by its DNA. By replicating the DNA before cell division, the new cells can maintain the same genetic instructions, allowing them to perform their designated roles effectively.

3. Growth and Development: In multicellular organisms, growth and development involve the production of new cells. DNA replication ensures that as cells divide and multiply, the genetic information remains consistent, supporting the organism's overall growth and development.

In summary, DNA needs to replicate before cells divide to ensure genetic continuity, maintain cell function and identity, and support the growth and development of the organism.