When yeast are grown on agar, which terms best describe the appearance of the colonies?

• A. Moist, creamy, and opaque
• B. Dry, rough, and filamentous
• C. Pigmented, wrinkled, and flat
• D. Mucoid, translucent, and spreading

Answer: (A)

Verified step by step guidance

1. Understand that yeast colonies grown on agar typically have distinct morphological characteristics that differentiate them from bacterial or mold colonies.
2. Recall that yeast colonies are generally moist rather than dry, which means they have a shiny or slightly wet appearance on the agar surface.
3. Note that yeast colonies often appear creamy in texture and color, resembling dairy products like cream or yogurt.
4. Recognize that yeast colonies are usually opaque, meaning they do not allow light to pass through easily, unlike translucent or transparent colonies.
5. Compare these characteristics with the given options to identify that 'Moist, creamy, and opaque' best describe yeast colonies grown on agar.