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Answer:
Three conditions which would alter the activity of an enzyme:
1. a pH greater or lower than the enzyme's optimal pH (usually 7).
2. temperature greater or lower than the enzyme's optimal temperature (usually 37 °C)
3. an increase or decrease of enzyme concentration.
Step-by-step explanation:
Enzyme activity is affected by pH, temperature, and enzyme concentration changes. As mentioned above, the enzyme works best at its optimal pH and temperatures. When it deviates from the optimums, the enzyme becomes denatured, losing its ability to bind to a substrate and catalyze product formation, therefore reducing the reaction rate (enzyme activity).