Question

question 9 (1 point) what color change occurs on mannitol salt agar if a bacterium ferments mannitol? green to black red to green pink to yellow blue to red question 10 (1 point) non - lactose fermenting bacteria on macconkey agar appear colorless. true false

Explanation:

Mannitol Salt Agar contains a pH - indicator. When bacteria ferment mannitol, they produce acids which lower the pH, causing a color change from pink to yellow. MacConkey agar contains lactose and a pH - indicator. Non - lactose fermenting bacteria do not produce acids from lactose fermentation, so they appear colorless.

Answer:

Question 7: C. Pink to yellow
Question 10: True