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BCH 3033 Exam 3 – help With Questions And 100% ALL SURE ANSWERS
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JACKLINEBCH 3033 Exam 3 – help With Questions And 100% ALL SURE ANSWERS
Terms in this set (131)
Pyrimidines CUT, one ring
Purines AG, two rings
Uncommon bases Found in RNA, xanthine, hypoxanthine, Uric acid
Cytosine can deaminate to form uracil. It would be impossible to tell if the uracil base was
Why does DNA use thymine not uracil? mutated cytosine or was supposed to be there. Thymine is methylated uracil so the methyl group
shows that the base is correct
Keto-enol tautomerization Keto = carbonyl = more stable + preferred. Enol = alcohol
Why does DNA absorb UV light? Aromatic rings
260nm:280nm 2 = pure RNA, 1.8=pure DNA
Deoxy used in DNA, 2' H not OH, fewer OH groups means more stable bc less susceptible to
2-deoxy-D-ribose vs D-ribose
Nucleosides outside forces and hydrolysis
soluble
1/6
, Why is 2' C the one with H not OH in DNA? Carbons 3' and 5' are involved in phosphodiester bonds and 4' is used to make ring
Base+sugar by glycosidic bond with anomeric carbon, syn or anti, sugars make it more water
BCH 3033 Exam 3 - help
2/6
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