Enzymes are needed inside cells in only minute quantities because they
Correct answer: D. are not consumed and can be reused repeatedly
- A. are very large molecules
- B. are made of DNA
- C. work only at very high temperatures
- D. are not consumed and can be reused repeatedly
Explanation
Since the enzyme emerges unchanged from each reaction, one molecule can process thousands of substrate molecules per second. Cells therefore regulate metabolism by controlling enzyme activity rather than by stockpiling enzyme.
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About Characteristics of Enzymes
Enzymes are globular biological catalysts that lower activation energy without being consumed, usually showing specificity for particular substrates. Questions cover active sites, enzyme substrate complexes, the lock and key and induced fit models, intracellular and extracellular action, and the effects of denaturation, while distinguishing enzymes from non biological catalysts.
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