GENETIC CODE

• HOW MANY THEORETICAL AA ARE THERE?

  64
• HOW MANY AAS ARE THERE ACTUALLY?

  20
• KEY FEATURES OF GENETIC CODE?

  • degenerate
  • universal
  • non-overlapping
• WHAT DOES DEGENERATE MEAN?

  most AAs coded for by more than one triplet
• WHAT DOES UNIVERSAL MEAN?

  each triplet codes for the same AA in each organism
• WHAT DOES NON-OVERLAPPING MEAN?

  each base in sequence is read only once
• EXONS?

  coding sequences
• INTRONS?

  non-coding sequences