Question

multiple choice question a non - nutritive component of media that can be liquefied at high temperatures and cools to a solid that can hold moisture and nutrients is ______

starch

gelatin

agar

peptone

Explanation:

To solve this, we analyze each option:

• Starch: Not typically used as a solidifying agent in media in this context.
• Gelatin: Can be liquefied and solidified but is not the primary non - nutritive solidifying agent for microbial media.
• Agar: Is a non - nutritive component of culture media. It liquefies at high temperatures (around 100°C) and solidifies upon cooling (around 45°C), and it can hold moisture and nutrients for microbial growth.
• Peptone: Is a nutritive component (provides nitrogen and carbon sources) and not a solidifying agent.

Answer:

C. agar