Question

amylase is an enzyme that catalyzes the chemical reaction that converts starch to glucose. if the concentration of starch is increased while the concentration of amylase is kept constant, how will this affect the rate of the chemical reaction? a. it will remain the same b. it will slow down and then stop c. it will increase and then level off d. it will decrease and then increase
the diagram shows a metabolic pathway. what would happen to the rate of production of d if enzyme 1 was not present? a. it wouldnt be any different b. it would stop c. it would be reduced d. it would be increased
what would happen to the rate of production of d if the concentration of enzyme 1 was increased but the concentration of enzymes 2 and 3 remained constant? a. it would stop b. it would go down c. it would go up d. it would stay the same
what should be on the x - axis? a. enzyme concentration b. substrate concentration c. enzyme concentration or substrate concentration d. ph
rate of reaction

Explanation:

• Q1: Enzymes increase reaction rates. With amylase concentration constant and starch (substrate) concentration increasing, more substrate - enzyme complexes can form initially, increasing the reaction rate until the enzyme is saturated.
• Q2: In a rate - of - reaction graph, the independent variable that affects the rate is typically on the x - axis. Substrate concentration is a common factor that affects the rate of an enzyme - catalyzed reaction, so it should be on the x - axis.
• Q3: Enzymes are catalysts. Without enzyme 1, the first step in the metabolic pathway cannot occur, so the production of D (the final product of the pathway) would stop as the pathway is blocked at the start.
• Q4: If the concentration of enzyme 1 is increased while enzymes 2 and 3 remain constant, more of the first intermediate in the pathway will be produced initially. This will increase the rate of production of D until the later enzymes (2 and 3) become the limiting factors.

Answer:

• Q1: C. It will increase and then level off
• Q2: B. Substrate concentration
• Q3: B. It would stop
• Q4: C. It would go up