University of Texas, DallasCHEM 3362BIOCH2 EXAM 2 STUDY GUIDE

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BIOL/CHEM 3362 - BIOCHEMISTRY II EXAM 2 STUDY GUIDE Know nucleotide structures: ○ Pyrimidines (​Pye CUT​) ■ ■ Cytosine ■ Uracil (in RNA only) ■ Thymine (in DNA only) ○ Purines (... ​Pure AG​) ■ ■ Adenine ■ Guanine 1. What is the basis of H-bonding between bases? Slide 7, 10,12 Chapter 11 a. Complementary base pairing in DNA allows base pairs to be arranged in most energetically favorable way (essential in helix formation) i. Any other configurations between nucleobases would hinder double helix formation. b. DNA strands oriented in opposite directions (antiparallel) c. Two chains of DNA helix held together with H bonding between complementary bases d. Base pairs arise from H-bonds i. A-T (2 H bonds)1. ii. C-G (3 H bonds) 1. iii. H bonding capacity of the DNA bases [Show More]

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