Passage VII

Enzymes are large protein molecules that increase the rate of chemical reactions in living systems. The substrate is the substance that interacts with the enzyme in a reaction. The acceleration factor is the factor by which the enzyme increases the rate of a reaction. Figures 1–3 show the effects that changes in temperature, pH, and substrate concentration have on the rate of reaction of a substrate when Enzymes A and B are present. Figure 4 shows the effects that changes in the concentrations of Enzymes A and B have on the rates of reaction in substrate solutions of the same concentration.

38. A scientist claims that the acceleration factor of Enzyme B is dependent on both enzyme and substrate concentration. Do the data in Figures 3 and 4 support her claim?

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

Looking at figure 3, with the increase of substrate concentration, the acceleration factors of A and B first increase, and then remain unchanged, indicating that the substrate concentration has an impact on the acceleration factor;

Look at figure 4 again, As the enzyme concentration increases, the acceleration factor also changes, so the statement in the stem is correct