Imagine that you've set up a genetic screen to identify E.coli mutants that cannot metabolize the amino acid tryptophan.Beginning with a master plate containing many colonies,you prepare replica plates on medium with glucose or tryptophan as the only energy source.You would look for colonies that _____.
A)cannot grow on either type of media
B)can grow on both types of media
C)can grow only on the plates with tryptophan
D)can grow only on the plates with glucose

Question

Quizplus · Accepted Answer

Colonies that can grow only on the plates with glucose indicate mutants that cannot metabolize tryptophan, as they fail to grow when tryptophan is the sole energy source.

Imagine That You've Set Up a Genetic Screen to Identify