Watson and Crick Using information from many researchers of their time, they assembled the first complete model of DNA as a double helix in 1953 Double.

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Presentation transcript:

Watson and Crick Using information from many researchers of their time, they assembled the first complete model of DNA as a double helix in 1953 Double helix = two strands of DNA twisted into a spiral staircase Their model explained 2 things: How information is stored in DNA How DNA could be copied They won the Nobel Prize in 1962.

Notes – Structure of DNA

DNA is a polymer

DNA is a polymer Nucleotide monomers have 3 parts: Phosphate group Sugar (deoxyribose) Nitrogenous Base:

DNA is a polymer Nucleotide monomers have 3 parts: Phosphate group Sugar (deoxyribose) Nitrogenous Base: Guanine (G) Thymine (T) Adenine (A) Cytosine (C)

DNA is double-stranded

DNA is double-stranded Two strands of nucleotides are held together by hydrogen bonds

DNA is double-stranded Two strands of nucleotides are held together by hydrogen bonds Base-pairs: The two strands have A bonded to T and G bonded to C

DNA is double-stranded Two strands of nucleotides are held together by hydrogen bonds Base-pairs: The two strands have A bonded to T and G bonded to C The two strands are complementary and are arranged in opposite directions

Eukaryotic DNA forms chromatin Chromatin = DNA wrapped around proteins During cell division, chromatin condenses into chromosomes

Eukaryotic DNA forms chromatin Chromatin = DNA wrapped around proteins During cell division, chromatin condenses into chromosomes