1. DNA Adenine and Thymine Guanine and Cytosine nucleotide Bases DOUBLE HELIX

2. DNA molecules are formed by building blocks of Nucleotides Nucleotide is made up of: 1 nitrogen base, 1 deoxyribose sugar and 1 phosphate molecule Shape of DNA is a double helix Sugar found in DNA is deoxyribose DNA replicates in which cycle? Interphase Only 4 bases in DNA: adenine-thymine guanine-cytosine

3. Nucleotide

4. DNA is a polymer Individual monomer units are called nucleotides DNA polymer is made up of sugar-phosphate group-one of the four bases DNA double helix is held together by hydrogen bonds In the double strand bases pair up A-T C-G

6. Nitrogen bases

9. REMEMBER- MITOSIS and MEIOSIS Before a cell divides it must make a COPY of its own chromosomes This happens thru DNA replication DNA strands are like a LONG zipper It unzips Each parent strand gets a complementary strand to hook up with its base New strands occur

12. How DNA replicates- parent strand- unzips- complementary strand hooks up – new bands

13. Sequencing of nucleotide bases