DNA Structure.

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Presentation transcript:

DNA Structure

What is DNA? What is DNA for?

DNA Deoxy-ribose Nucleic Acid Structure that has material that determines an organisms traits Trait: a characteristic that helps determine a unique individual (makes you YOU) No one’s DNA is the same (kinda like a fingerprint)

DNA Makes You YOU!

Discovery Discovered by James Watson and Francis Crick Made of two chains of nucleotides held together by nitrogenous bases

Nucleotides Structure made of three parts Phosphate Sugar Base

Nitrogenous Bases Four types of bases in DNA Adenine = A Guanine = G Cytosine = C Thymine = T

Purines and Pyrimidines Two Rings Adenine , Guanine One Ring Thymine , Cytosine

Bonding Bases bond to other bases in a very specific way ADENINE will ONLY bond with THYMINE CYTOSINE will ONLY bond with GUANINE

Two Chains - the two chains of nucleotides are bound together by the bases - chains bind together upside down! - two chains are also spirally around each other - the complete structure of DNA is called DOUBLE HELIX

Questions 1) What does DNA stand for? 2) What three parts make up the nucleotide? 3) What are the four types of bases? 4) Which bases are Purines? Pyrimidines 5) How would you describe the Double Helix? Answer at the back of your notes ( WRITE THE Q’S !!! )