Storing food in a refrigerator slows its decay mainly because low temperature
Correct answer: B. greatly reduces the rate of enzyme controlled reactions
- A. permanently denatures the enzymes of microbes
- B. greatly reduces the rate of enzyme controlled reactions
- C. kills all bacteria and fungi at once
- D. changes the pH of the food
Explanation
Cold reduces the kinetic energy of molecules so enzyme catalysed spoilage reactions slow dramatically, but the enzymes are not destroyed and work again on warming. This reversibility is exactly why freezing preserves food without sterilising it.
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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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