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MCAT Biology Question — Enzyme Function
- by
- Nov 25, 2014
- MCAT Biology, MCAT Blog, MCAT Question of the Day
Each of the following correctly describes an aspect of enzyme function EXCEPT:
- An enzyme will increase the rate at which a reaction will reach equilibrium by lowering the activation energy needed to convert reactants to products.
- Enyzmes function best in the presence of a large concentration of substrate and across a wide range of pH and temperature values.
- Those enzymes which work in the stomach function best at an acidic pH.
- If placed in a solution with no reactants but all products (of a simple one-step reaction mechanism) the enzyme will catalyze the reverse reaction and form reactants.
Explanation
Here, choice (B) is false because it states that enzymes work best across a wide range of pH and temperatures. In fact, enzymes function best at very specific pH and temperature values. For most enzymes in the body, this is a neutral pH and 37ºC.
A, C, D: These are all accurate descriptions of enzyme function.
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