Chapter 12.3 (Pgs: ): DNA Replication

The Replication Process 1.DNA separates into two strands -Accomplished by the enzyme helicase -Creates a replication fork -Each strand is a template for a new one

The Replication Process 2.New bases are added -Accomplished by the enzyme DNA polymerase, which also proofreads DNA -Follows the rules of base pairing -Moves in opposite directions

The Replication Process 3.Two identical copies are created -Each copy has an original strand and a new strand

The Replication Process 1.DNA separates into two strands -Accomplished by the enzyme helicase -Creates a replication fork -Each strand is a template for a new one 2.New bases are added -Accomplished by the enzyme DNA polymerase, which also proofreads DNA -Follows the rules of base pairing -Moves in opposite directions 3.Two identical copies are created -Each copy has an original strand and a new strand

Differences in DNA Replication -Prokaryotes have a single circular chromosome -Replication begins at one point and continues in two directions -Eukaryotes have multiple linear chromosomes -Replication begins in multiple places on a chromosome and continues in both directions

Telomeres -The tips of eukaryotic chromosomes -The ends of chromosomes are difficult to copy and can get cut off -The enzyme telomerase can repair the ends and keep the ends from becoming lost or damaged