Sulfa Antibiotics Damage Bacteria by Affecting a Certain Bacterial Enzyme

question 69

Multiple Choice

Sulfa antibiotics damage bacteria by affecting a certain bacterial enzyme. The sulfa antibiotic looks similar to a substrate normally required by the bacterial cells to live. The sulfa antibiotic occupies the active site of the required enzyme and blocks entry of its normal substrate. This prevents the bacteria from making nucleotides that are required for their reproduction and survival. Based on this information, the action of sulfa antibiotics is an example of:

• A)electron carriers.
• B)competitive inhibition.
• C)denaturing of proteins.
• D)activation energy.

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