A Compound Known as X-Gal Is Widely Used in Molecular

question 14

Multiple Choice

A compound known as X-Gal is widely used in molecular genetic research.When wild-type (normal) E.coli is grown on medium containing X-Gal,the bacterial colonies turn blue.In contrast,when lacZ mutants are grown on medium containing X-Gal,the bacterial colonies remain their normal white color.What is X-Gal likely to be?

• A)a compound chemically similar to glucose
• B)a compound chemically similar to galactose
• C)a compound chemically similar to lactose
• D)a compound that cannot be transported into lacZ mutants
• E)a compound that can only be transported into lacA mutants

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