When Ecoli Is Grown in a Medium with Low Levels of of Lactose

question 139

Multiple Choice

When E.coli is grown in a medium with low levels of lactose,

• A) all the enzymes of the lactose operon are present in very small quantities.
• B) all the enzymes of the lactose operon are present in large quantities.
• C) no enzymes of the lactose operon are present.
• D) β-galactosidase and permease are present in small quantities, but transacetylase is present in large quantities.
• E) the mRNA of the lactose operon is not present at all.

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