1What do you expect to see on the two PE plates Give a detai

1.What do you expect to see on the two PE plates? Give a detailed explanation? 2. You swabbed a PE agar plate and an LB agar plate with an E.coli culture. After a 24-hour incubation period at 37*C, both plates show the same amount of growth. Did you expect this result? If not, give a detaled explanation for this result.

Solution

1. Polyethylene agar is a selective media is used to cultivate gram positive bacteria. PEA is the media inhibits the growth of the Gram negative bacteria by inhibiting the DNA synthesis.

2. E coli is a gram negative bacteria that is why there will not be nay growth in PEA media but it will grow in LB agar because LB agar is not selective media.