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8 Cards in this Set
- Front
- Back
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What carries traits |
20th century scientists thought proteins carried genetic factors. By using bacteria and mice they proved DNA carried traits. |
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DNA structure - credit |
Watson and Crick are credited with discovering the structure of DNA using x-ray crystallography data from Rosalind Franklin |
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DNA structure |
Double helix Each DNA subunit, nucleotide, contains - deoxyribose sugar - phosphate - nitrogenous base |
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Where DNA is |
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Structure - detail |
Backbone of sugar and phosphate The order of bases makes a unique code 4 bases: Thymine, Guanine, Cytosine, Adenine |
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Base grouping |
Purines are double ringed structures ( 2n in name ) - Adenine and Guanine Pyramidines are single ringed structures (one n ) - Cytosine and Thymine |
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Charaff's rule |
Purines always pair with a pyramidine Adenine and Thymine (At&t) - double hydrogen bond Guanine and Cytosine (gc3) - triple hydrogen bond |
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5' free phosphate (5 phos) 3' free sugar (s3) Form as opposites one 5' up and 5' down on the other side 5' is long end |
