How does DNA replication ensure that cells can divide to grow or repair tissue?

DNA replication is a semi-conservative process that creates two identical DNA molecules, each containing one original and one new strand, enabling accurate cell division.

Step-by-Step Solution:
DNA double helix unzips when hydrogen bonds break between base pairs
DNA helicase enzyme separates strands; each acts as a template
DNA polymerase adds complementary nucleotides (A-T, C-G) to each template strand
Two identical DNA molecules form, ensuring each new cell gets exact genetic copies
Quick check: Each new DNA molecule must contain one old and one new strand

Key Mistake to Avoid: Don't confuse DNA replication (copying genetic material) with transcription (making mRNA for protein synthesis) - they are separate processes with different purposes.

Quick Tip: Remember "semi-conservative" by thinking "half old, half new" - each new DNA molecule keeps one original strand.