Multiple Choice
In an introductory microbiology lab, if the only test that turned out positive was for catalase activity, which of the following organisms was most likely present?
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1. Introduction to Microbiology
Introduction to Microbiology
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Which of the following body sites is typically free of normal microbiota?
A
Colon
B
Oral cavity
C
Bloodstream
D
Skin
Verified step by step guidance1
Understand the concept of normal microbiota: these are the microorganisms that normally reside on or within various body sites without causing disease, often providing beneficial effects.
Review each body site listed: the colon and oral cavity are well-known to harbor diverse and abundant microbiota; the skin also has a characteristic community of microbes.
Recognize that the bloodstream is a normally sterile environment, meaning it does not typically contain any microorganisms under healthy conditions.
Recall that the presence of microbes in the bloodstream usually indicates infection or disease, such as bacteremia or septicemia.
Conclude that among the options given, the bloodstream is the body site typically free of normal microbiota.
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