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Enzymes ((The molecule acted upon by an enzyme is KA substrate, Each…

- - - - Humans – 37°c
      - Bacteria that live at 10°c will have enzymes with optimum temp ~10°c
    - - ^ temp
        » enzyme and substrate molecules have more KE
        » more collisions
        » more frequent reactions
    - - Enzymes are made of protein
      - Proteins are broken down by heat
      - ≥40°c, heat destroys the enzymes, KA denatured
      - eg. Egg white is protein
        » heat denatures egg white
        » turns from clear runny liquid –––> white solid
      - Denaturing:
        – Permanent
        – Changes the shape of active site so substrate no longer fits
  - - - Stomach produces hydrochloric acid—pH of 2
      - Stomach makes enzyme called pepsin
      - Pepsin has opt pH of 2