Effect of temp and pH on enzymes

• What is the effect of temperature on enzyme activity?

  Temperature affects the rate of enzyme reactions
• What is the role of enzymes in chemical reactions?

  Enzymes speed up chemical reactions
• What is the groove on an enzyme's surface called?

  Active site
• What is a substrate in relation to enzymes?

  Substrate is the molecule that enzymes react with
• What does the lock and key theory describe?

  It describes how substrates fit into active sites
• How does increasing temperature affect enzyme activity?

  It increases the rate of reaction until optimum
• What is the optimum temperature for most human enzymes?

  37 degrees Celsius
• What happens to enzyme activity when temperature exceeds the optimum?

  Activity rapidly decreases to zero
• What does it mean when an enzyme's active site is denatured?

  It means the substrate no longer fits perfectly
• What is the effect of pH on enzyme activity?

  pH affects the rate of enzyme reactions
• What is the optimum pH for an enzyme?

  It is the pH where activity is maximum
• What happens to enzyme activity in extreme pH conditions?

  Activity drops to zero due to denaturation
• Which enzyme works best at an acidic pH?

  Protease enzyme in the stomach
• Which enzyme works best at an alkaline pH?

  Lipase enzyme from the pancreas
• What are the effects of temperature and pH on enzyme activity?

  • Temperature increases reaction rate until optimum
  • Optimum temperature for human enzymes is 37°C
  • High temperatures denature enzymes, stopping activity
  • pH affects enzyme activity, with optimum pH for each enzyme
  • Extreme pH conditions denature enzymes, stopping activity
• Where can you find questions on enzyme activity effects?

  In the vision workbook