Question

enzyme-enhanced reaction
ph of solution | temperature of solution (°c) | relative enzyme activity (%)
5 | 10 | 8
6 | 15 | 65
7 | 20 | 100
8 | 25 | 55
9 | 30 | 23
a student investigated the effect of temperature and ph on an enzyme - enhanced reaction. the results did not match what was expected. which statement correctly explains why the cause of the change in the enzyme activity cannot be determined?
a. two variables were changed at the same time, producing conflict in the data.
b. the enzyme functioned the same under different conditions.
c. the concentration of the enzyme increased with changing conditions.
d. the optimum enzyme activity resulted when the temperature changed the ph.

Explanation:

To determine the cause of enzyme activity change, a controlled experiment should change only one variable at a time. In this data, both pH and temperature are changed simultaneously (e.g., pH 5 with 10°C, pH 6 with 15°C, etc.). This means we can't tell if changes in enzyme activity are due to pH, temperature, or their interaction. Option A correctly identifies this flaw. Option B is wrong as enzyme activity clearly changes. Option C has no data on enzyme concentration. Option D is incorrect as the data doesn't show temperature changing pH to cause optimum activity.

Answer:

A. Two variables were changed at the same time, producing conflict in the data.