Two Strains of E

question 58

Multiple Choice

Two strains of E. coli-one of which can turn on its lactase production and one that cannot-are grown together with lactose in the medium. If all other conditions are equal, what will occur?

• A) Both strains will continue to be present in equal amounts.
• B) The two strains will kill each other off.
• C) The strain that can turn on lactase production will outcompete the other strain.
• D) The strain that cannot turn on lactase production will outcompete the other strain.
• E) The two strains will work cooperatively and share the lactose.

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