Only the related key can open the lock. How is this fact true for enzymes? Explain with examples.

This analogy refers to the specificity of enzymes. The enzyme’s active site is like a lock, and only substrates with the correct shape and chemical properties (the right “key”) can bind to the active site and initiate the reaction. For example, the enzyme amylase only catalyzes the breakdown of starch because its active site is specifically shaped to fit the starch molecule.

Related Questions:

  1. Define enzyme and describe their characteristics and specifications.
  2. What is the energy of activation? Explain with reference to enzyme.
  3. What happens to enzymes when you increase or decrease: (a) Temperature (b) pH (c) Substrate concentration?
  4. Describe the structure and uses of ATP.
  5. Describe and sketch light reactions of photosynthesis.
  6. Describe and sketch dark reactions of photosynthesis?
  7. Explain the factors affecting the rate of photosynthesis.
  8. Compare respiration and photosynthesis with examples.
  9. What are the advantages and significance of anaerobic respiration and fermentation in your daily life?
  10. Define enzyme and describe their characteristics and specifications.
  11. Describe and explain the process of aerobic respiration.
  12. Describe the structure and uses of ATP.
  13. Why are enzymes called biological catalysts?
  14. Name the factors affecting enzyme activity. At what pH do pepsin and trypsin enzymes act the best?
  15. What happens to an enzyme when it is frozen below 0°C?
  16. What happens when a protein-digesting enzyme functions in an acidic medium?
  17. How does an enzyme lower the activation energy?
  18. Why are enzymes specific and why can’t each one speed up many different reactions?
  19. Why is a small quantity of enzyme enough for catalyzing a large number of substrate molecules into products?
  20. According to the induced fit model, the active site is flexible. Does it mean that any substrate can attach to this flexible active site? If not, then explain.