Question

multiple choice question
______ makes a good solidifying agent for culturing medium because it is flexible and can hold moisture and nutrients while not acting as a nutrient for most microbes

○ starch
○ agar
○ peptone
○ gelatin

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Explanation:

To determine the correct solidifying agent for culturing medium, we analyze each option:

• Starch: Not typically used as a solidifying agent for microbial culture media.
• Agar: Is a common solidifying agent for culture media. It is flexible, holds moisture and nutrients, and most microbes do not utilize it as a nutrient.
• Peptone: Is a nutrient source (provides nitrogen) and not a solidifying agent.
• Gelatin: While it can solidify, many microbes can degrade gelatin, so it's not ideal for most microbial cultures.

Answer:

B. Agar