DNA Replication Process and Key Components

The process of DNA replication begins when cells need to divide, ensuring each new cell receives a complete copy of genetic material. The replication process follows several distinct steps, each catalyzed by specific enzymes.

Definition: DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule.

Highlight: The process is semiconservative, meaning each new DNA molecule contains one original parent strand and one newly synthesized strand.

Vocabulary:

• Helicase: Enzyme that breaks hydrogen bonds between DNA strands
• Primase: Enzyme that adds RNA primers
• DNA Polymerase: Enzyme that adds new DNA nucleotides
• Ligase: Enzyme that joins DNA fragments together

The replication process involves four main steps:

1. Helicase unzips the DNA double helix
2. Primase adds RNA primers to initiate replication
3. DNA Polymerase adds nucleotides in the 5' to 3' direction
4. Ligase seals gaps in the sugar-phosphate backbone

Example: On the lagging strand, DNA is synthesized in short segments called Okazaki fragments because DNA polymerase can only work in the 5' to 3' direction.

Quote: "RNA Primers are removed and replaced with DNA nucleotides" to complete the replication process.