Sulfa drugs control bacterial infections because they
Correct answer: D. resemble PABA and competitively block the bacterial enzyme that uses it
- A. denature every bacterial protein at once
- B. dissolve the bacterial membrane
- C. raise the temperature inside the bacterium
- D. resemble PABA and competitively block the bacterial enzyme that uses it
Explanation
The drug mimics para-aminobenzoic acid, a substrate bacteria need to make folic acid, so it occupies the enzyme's active site and starves the pathway. Humans obtain folate from food, which is why the drug harms bacteria selectively.
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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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