View
6
Download
0
Category
Preview:
Citation preview
DNA Replication
DNA Replication
• In order to copy the DNA double helix, the DNA needs to unravel and expose the nucleotides.
• DNA Helicase is a protein that comes in, unlocks the base pairs and separates the strands.
DNA Polymerase
• Once the strands are separated, another protein called DNA polymerase attaches to the strands and begins attaching matching base pairs.
New base pairs being added
New base pairs being added
DNA Replication
DNA Helicase
DNA PolymeraseDNA Polymerase
Overview
DNA Replication
Binary Fission
• Prokaryotes (bacteria) reproduce by binary fission.
Bacteria• Step 1- replicate the single chromosome.
• Step 2- replicate the DNA plasmids
• Step 3- separate the two sister chromatids and the plasmids.
• Step 4- Begin pinching off the cell
• Step 5- Separate into two new bacteria
Chromosomes• A single long piece of DNA – wrapped up
and bound into a tight formation.
• Contains between 50-250 million base pairs
Humans have 23 pairs of Chromosomes (46 total)
Sister Chromatids- Duplicated identical pieces of DNA
After duplication, the two identical strands are now called Chromatids
Sister chromatids are held together by the
Human Chromosomes After Duplication
It takes _____ minutes to duplicate the DNA of one cell
Recommended