Discussion
An enzyme
Answer: D
Correct answer: is heat and pH labile
Enzymes are proteins, and their activity depends on a precise three-dimensional shape, so they are denatured by heat and by pH extremes. The other statements are all false: an enzyme is highly specific for its substrate, and it is neither consumed by the reaction nor built into the products - which is why a small amount can turn over a great deal of substrate.
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