DNA

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DNA
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DeoxyriboNucleic Acid

• DNA stands for deoxyribonucleic acid
• Every cell in every organism contains DNA
• Shape spiral staircase, double helix, twisted
  ladder

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What makes up DNA?

• Handrails ? made of sugar and phosphate molecules
• Steps (rungs) ? made up of nitrogen bases
• Nitrogen bases are
• Adenine
• Guanine
• Cytosine
• Thymine
• Nucleotide ? a subunit that consists of a sugar,
  a phosphate, and a nitrogen base

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Nitrogen Bases

• Adenine always pairs with Thymine
• Cytosine always pairs with Guanine
• According to the findings of Erwin Chargaff the
  amount of adenine always equals the amount of
  thymine and the amount of cytosine always equals
  the amount of guanine

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Rosalind Franklin

• British chemist
• Bounced X-rays off a DNA molecule
• Spiral shape

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Watson and Crick

• Combined research of Chargaff and Franklin to
  form first model of DNA
• They described it as a long twisted ladder

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The End