DNA & RNA

• dna - also known as deoxyribonucleic acid
• gene - a length of DNA that codes for a specific protein
• amount of cytosine = amount of guanine
• amount of thymine = amount of adenine
• purines - double ring
• pyrimidines - single ring
• phosphodiester bonds - nucleotides
• hydrogen bond - nitrogenous bases
• dna - consists of five-carbon sugar, nitrogenous base, phosphate group
• DNA

  • side: pentose sugar
  • bonded: phosphate (PO4) groups
  • center: nitrogen bases bonded to weak hydrogen bonds
• three hydrogen bonds require to bond Guanine and

  Cytosine
• two hydrogen bonds required to bond Adenine and

  Thymine