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DNA - PowerPoint PPT Presentation


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DNA. DNA Functions. Stores genetic information to build and maintain a living organism Copies itself. James Watson & Francis Creek 1953. Determined the three-dimensional structure of DNA One of the greatest discoveries in the history of science Nobel prize in 1962. DNA.

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dna functions
DNA Functions
  • Stores genetic information to build and maintain a living organism
  • Copies itself
james watson francis creek 1953
James Watson & Francis Creek 1953
  • Determined the three-dimensional structure of DNA
  • One of the greatest discoveries in the history of science
  • Nobel prize in 1962
slide4
DNA
  • Made of repeating units called nucleotides
  • Each nucleotide made of a sugar named deoxyribose, a phosphate and a base
dna nucleotide

=

Deoxyribose

Base

Phosphate

DNA Nucleotide
base pairing rule
Base Pairing Rule
  • Adenine pairs with Thymine
  • Guanine pairs with Cytosine
slide9
DNA
  • Total length of DNA in each cell is about 6 feet
  • Wraps around proteins called histones
  • Over 3 billion nucleotide pairs in human DNA!
dna replication
DNA Replication

DNA strands separate

DNA nucleotides attach to

each strand

dna errors
DNA Errors
  • Replication is not 100% accurate
    • Errors occur when copying DNA
  • DNA damaged
    • Ultraviolet light
    • X-rays
    • Cigarette smoke
    • Nitrates (smoked meat)
    • Pesticides & Herbicides