structure of DNA

• 3 components of DNA nucleotide

  deoxyribose sugar

  phosphate

  base
• bond between bases


  hydrogen - weak bonds
• bond between phosphate


  strong chemical bonds
• dna structure


  phosphate at 5 prime end

  base at 3 prime end

  antiparallel - one 3 - 5 prime. other 5 - 3 prime
• genetic code


  the order of sequence of bases
• dna in a prokaryotic cell

  circular chromosomes

  plasmids
• dna in a eukaryotic cell

  nucleus - linear chromosome

  chloroplast and mitochondria - circular chromosome
• linear chromosomes are coiled around

  histones
• yeast contains


  PLASMIDS