2.6  Structure of DNA and RNA

big ninja

Essential Idea:

The structure of DNA allows

efficient storage of genetic information


  • The nucleic acids DNA and RNA are polymers of nucleotides
  • DNA differs from RNA in the number of strands present, the base composition and the type of pentose
  • DNA is a double helix molecule made of two antiparallel strands of nucleotides linked by hydrogen bonding between complementary base pairs


  • Crick and Watson’s elucidation of the structure of DNA using model making


  • Drawing simple diagrams of the structure of single nucleotides of DNA and RNA, using circles, pentagons and rectangles to represent phosphates, pentoses and bases