CIE IGCSE Biology: 复习笔记:5.1.5 Enzymes & pH: Extended

CIE IGCSE Biology: 复习笔记:5.1.5 Enzymes & pH: Extended

Enzymes & pH: Extended

  • The optimum pH for most enzymes is 7 but some that are produced in acidic conditions, such as the stomach, have a lower optimum pH (pH 2) and some that are produced in alkaline conditions, such as the duodenum, have a higher optimum pH (pH 8 or 9)
  • If the pH is too high or too low, the bonds that hold the amino acid chain together to make up the protein can be destroyed
  • This will change the shape of the active site, so the substrate can no longer fit into it, reducing the rate of activity
  • Moving too far away from the optimum pH will cause the enzyme to denature and activity will stop

Effect-of-pH-on-enzyme-activity

Effect of pH on enzyme activity

Graph-showing-effect-of-pH-on-rate-of-activity-for-an-enzyme-from-duodenum

Graph showing the effect of pH on rate of activity for an enzyme from the duodenum

转载自savemyexams

 

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