Activity Nº4
“Optimal culture media for microorganisms”
Materials:
• Three 17 oz clean plastic bottles
• 3 cups of warm boiled water
• 1 beef bouillon cube
• Bowl to dissolve the bouillon cube
• 1 spoon (15 mL)
• Vinegar
• Salt
• Permanent marker
Dissolve the beef bouillon cube in 3 cups of water. Distribute
the content in the three bottles (1 cup per bottle). In the first
bottle, add 5 tablespoons of salt. In the second one, add 5
spoons of vinegar. And in the third one, do not add anything.
The third one will be the control bottle. Label each bottle to
easily distinguish them and place them in a warm place. Incubate for five days. After the incubation period, analyze the
bottles and compare their turbidity or lack of transparency.
Higher turbidity levels indicate greater growth of microorganisms.
