DNA Structure
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6 Terms
1
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Purines
A(adenine), G(guanine), **DOUBLE RINGED**
2
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Pyrimidines
C (cytosine), T (Thymine), **Single ringed**
3
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Nucleotide structure
* 5 sugar is attached to a phosphate group and a nitrogenous base
* 4 carbons make a ring w an oxygen and the 5th carbon extends out, carbons are numbered from the o
* nitrogenous base is attached to the 1st carbon, phosphate is attached to the 5th (the one extending out)
* next nucleotide attaches to carbon 3
* 4 carbons make a ring w an oxygen and the 5th carbon extends out, carbons are numbered from the o
* nitrogenous base is attached to the 1st carbon, phosphate is attached to the 5th (the one extending out)
* next nucleotide attaches to carbon 3
4
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2 hydrogen bonds
A and T
5
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3 hydrogen bonds
G and C
6
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Helix
* turns every 10 nucleotides
* antiparallel- one strand goes 5 to 3, other goes 3 to 5
* 3 ends w a hydroxyl
* 5 ends w a phosphate
* antiparallel- one strand goes 5 to 3, other goes 3 to 5
* 3 ends w a hydroxyl
* 5 ends w a phosphate