3.3.13.4 - DNA

• what is DNA (deoxyribonucleic acid)?


  condensation polymer formed from a sugar, a phosphate and a base
• nucleotides


  these molecules join together to form a nucleotide which consists of one of each molecule

  
• sugar present


  2-deoxyribose
• what do the sugar-phosphate bonds do?

  hold together multiple nucleotides into a polynucleotide strand and the bonds make up what is known as a 'sugar-phosphate backbone'
• sugar-phosphate backbone

  
• possible bases present in the nucleotide

  • adenine
  • cytosine
  • thymine
  • guanine
• what do the bases pair up to allow a single strand of DNA to do?

  join with another via H-bonding to form a double helix structure of DNA

  
• complementary bases 


  to join the protein strands, the bases pair up in specific, complementary pairs
• guanine and cytosine

  
• thymine and adenine