Exam Qs

Question 1

Describe the induced - fit model and how an enzyme acts as a catalyst.

Answer 1

Active site changes shape slightly so it’s complementary to the substrate. The substrate binds to the active site to form enzyme-substrate complexes. Enzymes lower the activation energy by providing an alternate pathway.

Question 2

Retrograded starch is a competitive inhibitor of amylase. Suggesting how eating stale bread could help to reduce weight gain.

Answer 2

Retrograded starch binds to the active site so less starch is hydrolysed into maltose, so less glucose is absorbed.

Question 3

Explain how the active site of an enzyme cause a high rate of reaction.

Answer 3

Lowers the activation energy as the induced fit cause the active site to change shape slightly so when it forms Enzyme-Substrate complexes it causes stress on bonds

Question 4

Formation of an enzyme - substrate complex increases