Question Detail

MIC 121 CULTURE MEDIA Objective Question

Question

On a MacConkey agar plate, what color do lactose-fermenting E. Coli colonies typically appear?
Options
A Cream-colored
B Bright pink
Correct Answer
C Yellow
D Tan
Correct Answer

Option B is the correct answer.

Detailed Explanation

Page 15, in the 'SELECTIVE MEDIUM' caption, states 'On this MacConkey agar plate, the lactose-fermenter E. Coli colonies are bright pink.'

Hint

MacConkey agar is a differential medium; consider how lactose fermentation is visualized.

Question Info