A researcher is looking for met- strains. He compares two plates. One plate has colonies growing on complete medium. The other plate has colonies growing on methionine deficient medium. How can the researcher determine which colonies are met- ?
A) The colonies growing on the methionine-deficient plate are met- .
B) Colonies growing on complete medium but not on methionine-deficient medium are met- .
C) More experiments must be performed to identify the met- colonies.
D) All of the colonies growing on complete medium are met- .
E) Colonies growing on methionine-deficient medium but not on complete medium are met- .
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