DNA - Dearborn Public Schools

DNA - Dearborn Public Schools

DNA Notes! DNA 1. Made up of monomers called nucleotides 2. There are only four different nucleotides 3. The nucleotides are repeated over and over

NUCLEOTIDES 4. A DNA nucleotide has three parts A. Nitrogen Base B. Phosphate Group C. Deoxyribose Sugar Nucleotides Adenine Purines Guanine

Cytosine Pyrimidines Thymine 5. The purines (Adenine & Guanine) have two rings of nitrogen bases 6. The pyrimidines (Thymine & Cytosine) have only one ring of nitrogen

base 7. Label The Ladder Nucleotide 8. Nucleotides line up in pairs to form a structure that looks like a ladder. 9. The sugar and phosphate groups make up the sides of the ladder

H-Bond Sugar & Phosphate backbone Key Adenine (A) 10. The base pairs make up the rungs of the ladder

Thymine (T) Cytosine (C) Guanine (G) Complementary Base Pairing The nucleotides only bond with certain other nucleotides 11. Cytosine forms three hydrogen bonds with Guanine

12. Adenine forms two hydrogen bonds with Thymine Franklin and Wilkins 13. Rosalind Franklin and Maurice Wilkins took the first X-ray photographs of DNA THE

14. DOUBLE HELIX Proposed by Watson and Crick in 1953 DNA is composed of two nucleotide chains that twist around to form a structure similar to a twisted ladder Each turn has 10 base

pairs Video http://ed.ted.com/lessons/the-twisting-tale-ofdna-judith-hauck

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