Multiple Choice
Staphylococcus aureus is known for its ability to tolerate high salt concentrations. Under which two of the following NaCl concentrations would S. aureus most likely survive?
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1. Introduction to Microbiology
Introduction to Bacteria
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Which of the following is most commonly used as a solidifying agent in bacterial culture media?
A
Gelatin
B
Cellulose
C
Agar
D
Starch
Verified step by step guidance1
Understand the purpose of a solidifying agent in bacterial culture media: it provides a firm surface for bacteria to grow and form colonies.
Review the properties of each option: Gelatin, Cellulose, Agar, and Starch, focusing on their ability to solidify and support bacterial growth.
Recall that Gelatin melts at relatively low temperatures and can be degraded by some bacteria, making it less ideal as a solidifying agent.
Note that Cellulose and Starch are not commonly used as solidifying agents in microbiological media because they do not form a stable gel suitable for bacterial culture.
Recognize that Agar is the most commonly used solidifying agent because it remains solid at incubation temperatures, is not easily degraded by bacteria, and provides a stable medium for bacterial growth.
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