1. Section 8-2B: DNA Replication
Chapter 8: DNA and RNA
Section 8-2B:
DNA Replication

2. DNA Replication
If the two strands separate, the sequence of bases on each strand can be used as a template to form an exact duplicate
Replication occurs during the S phase of the cell cycle and is semiconservative
Carefully controlled by enzymes
Strands are separated, new strands created by DNA polymerase

3. DNA and Chromosomes
In eukaryotes, DNA is contained in chromosomes in the nucleus
Chromosomes are DNA and proteins (more protein than DNA)
Chromatin is the material that makes up chromosomes

4. DNA and Chromosomes Histones are proteins that bind directly to DNA
Histone + DNA wrapped around it = nucleosome
Nucleosomes help package DNA into chromosomes (also aid in transcription)
The DNA in a single chromosome may be 10,000X longer than the chromosome itself

5. Animations