Nocardia species are catalase-positive and aerobic.

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Multiple Choice

Nocardia species are catalase-positive and aerobic.

Explanation:
Nocardia are aerobic bacteria that require oxygen to grow and possess the enzyme catalase, which breaks down hydrogen peroxide. This catalase-positive status helps them survive oxidative stress in air-rich environments, aligning with their typical growth in aerobic culture and in clinical samples exposed to oxygen. Thus, the defining lab characteristics are that they are catalase-positive and aerobic, distinguishing them from anaerobes (which don’t grow well without oxygen and can be catalase-negative) and from catalase-negative organisms.

Nocardia are aerobic bacteria that require oxygen to grow and possess the enzyme catalase, which breaks down hydrogen peroxide. This catalase-positive status helps them survive oxidative stress in air-rich environments, aligning with their typical growth in aerobic culture and in clinical samples exposed to oxygen. Thus, the defining lab characteristics are that they are catalase-positive and aerobic, distinguishing them from anaerobes (which don’t grow well without oxygen and can be catalase-negative) and from catalase-negative organisms.

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