Replication- process of copying DNA prior to cell division
DNA Polymerase- principal enzyme that joins individual nucleotides to produce a new strand of DNA
Telomeres- repetitive DNA at the end of a eukaryotic chromosome.
Before a cell divides, it duplicates it DNA during replication, which occurs during late interphase of the cell cycle. This ensures that each resulting cell has the same complete set of DNA molecules. During replication the DNA molecule seperates into two strands and then produces two new complementary strands following the rules of base pairing.
the two strands of the double helix have separated allowing two replication forks to form. for example if strand that has a base sequence TACGTT, the new strand would be ATGCAA.
DNA replication is carried out by a series of enzymes that first unzip a molecule if DNA by breaking the hydrogen bonds between base pairs and unwinding the two strands of the molecule. DNA polymerase is an enzyme that joins individual nucleotides to produce a new strand of
DNA.
DNA at the tips of chromosomes are difficult to replicate so the yuse a specail enzyme called telomerase, by adding chort, repeated DNA sequences to the telomerase. telomerase help to prevent genes from being damaged.
DNA replication occurs in the S phase of the cell cycle. Replication in most prokaryotic cells starts from a single point and proceeds in two directions until the entire chromosome is copied.
DNA replication in eukaryotic cells may begin at dozens or even hundreds of places on the DNA molecule, proceeding in both directions until each chromosome is completely copied.
prokaryotic DNA
Eukaryotic DNA
No comments:
Post a Comment