Understanding DNA

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Understanding DNA
Deoxyribonucleic Acid
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1. Made of Nucleotides
A. Sugar (deoxyribose)
B. Phosphate Group
C. Nitrogen Bases
B
A
C
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2. Rules for Base Pairing
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stores genetic information
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Fun Facts

• If you wrote down all of the
• bases in one cell, you would
• fill a stack of 1,000 phone
• books with A's, T's, G's and C's

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Fun Facts
If you unraveled all your chromosomes
from all of your cells and laid out the DNA
end to end, the strands would stretch from the
Earth to the Moon about 6,000 times.
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Frederick Griffith
History Scientists

• He noticed that the instructions contained in the
  genes are transmitted by chemical compounds
  (1928)

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Erwin Chargaff

• Chargaff determine that the amount of A is equal
  to the amount of T and that the amount of C was
  equal to the amount of G he did not actually
  know that they bonded together though (1950)

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Erwin Chargaff
C
G
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Rosalind Franklin Maurice Wilkins

• They made X-ray pictures of DNA (1952)

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James Watson Francis Crick

• They used Franklin Wilkins X-ray pictures to
  determine the structure of DNA (1953)

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James Watson Francis Crick
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Phosphate
Nitrogen Bases
Sugar
C
G
A
A
T
G