Return to Contents Chapter 28: Nucleosides, Nucleotides and Nucleic Acids Ch 28 contents

Nucleosides, Nucleotides and Nucleic Acids questions
 

Qu 1: Draw the resonance contributor for thymine that shows its aromatic character.
   thymine
Qu 2: Is caffeine, shown below, a purine or a pyrimidine derivative ?
  caffeine 
Qu 3: Why has nature developed a triplet code (e.g. ACG) rather than a doublet code (e.g. AT) for DNA / RNA / protein biosynthesis ?
Qu 4: For each of the following structures identify :
  i the base
 ii the carbohydrate
iii nucleoside or a nucleotide ?
iv DNA or a RNA system ?
(a)
(b)
(c)

Answers ?


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organic chemistry © Dr. Ian Hunt, Department of Chemistry University of Calgary