What substance is used as food for the bacteria, and in what two forms is it found in the lab?

What substance is used as food for the bacteria, and in what two forms is it found in the lab?

• A. LB, found as liquid broth and solid gel.
• B. LB, found only as liquid broth.
• C. LB, found as liquid broth and solid agar gel.
• D. Nutrient broth, found as powder and solution.

Answer: (C)

In this context, the bacteria are fed by a rich nutrient medium called LB (Lysogeny Broth), which provides the nutrients bacteria need to grow. In the lab, LB comes in two forms: a liquid broth, used for growing cultures in tubes or flasks, and LB agar gel, where the broth is solidified with agar to create plates for colony growth. This is why the best answer identifies LB as the food and notes it appears as both liquid broth and solid agar gel.

In this context, the bacteria are fed by a rich nutrient medium called LB (Lysogeny Broth), which provides the nutrients bacteria need to grow. In the lab, LB comes in two forms: a liquid broth, used for growing cultures in tubes or flasks, and LB agar gel, where the broth is solidified with agar to create plates for colony growth. This is why the best answer identifies LB as the food and notes it appears as both liquid broth and solid agar gel.