Enzymes:
* DNA Polymerase: The main enzyme responsible for synthesizing new DNA strands. It reads the existing DNA strand as a template and adds complementary nucleotides to build a new strand. Different types of DNA polymerases exist, each with specific roles in the process.
* Helicase: Unwinds the DNA double helix, separating the two strands to provide access for replication.
* Primase: Synthesizes short RNA primers that provide a starting point for DNA polymerase to begin adding nucleotides.
* Ligase: Joins the Okazaki fragments, short DNA segments synthesized on the lagging strand, to create a continuous DNA strand.
* Topoisomerase: Relaxes the supercoiling of DNA, preventing tangles and knots during replication.
Other molecules:
* Single-stranded binding proteins (SSBs): Stabilize the separated DNA strands, preventing them from re-annealing.
* Deoxyribonucleoside triphosphates (dNTPs): The building blocks of DNA, containing the four bases (adenine, guanine, cytosine, and thymine) and the energy needed for polymerization.
* Origin of replication (ori): A specific sequence of DNA where replication begins.
Key processes:
* Initiation: The process begins at the origin of replication, where the DNA strands are separated and replication forks are formed.
* Elongation: DNA polymerase adds nucleotides to the new DNA strand, using the existing strand as a template. This process occurs in a 5' to 3' direction.
* Termination: Replication ends when the two replication forks meet.
Summary: These molecules work together in a coordinated manner to ensure accurate and efficient replication of the DNA molecule, providing genetic continuity for the cell.
