Multiple Choice
Which type of bacteria live in the roots of legumes and are responsible for nitrogen fixation?
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1. Introduction to Microbiology
Introduction to Bacteria
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Which bacterial enzyme can render cell wall inhibitor drugs, such as penicillins, ineffective by breaking down their structure?
A
DNA gyrase
B
RNA polymerase
C
Beta-lactamase
D
Catalase
Verified step by step guidance1
Identify the function of each enzyme listed in the options to understand their roles in bacterial cells.
Recall that DNA gyrase is involved in supercoiling bacterial DNA and is a target for quinolone antibiotics, not penicillins.
Understand that RNA polymerase is responsible for synthesizing RNA from DNA and is targeted by rifampin, not penicillins.
Recognize that catalase breaks down hydrogen peroxide into water and oxygen, protecting bacteria from oxidative damage, but does not affect penicillin.
Know that beta-lactamase is an enzyme produced by some bacteria that breaks the beta-lactam ring structure of penicillin and related antibiotics, rendering these drugs ineffective.
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