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 colour. What is X- Gal likely to be?
A) a compound chemically similar to glucose
B) a compound chemically similar to lactose
C) a compound chemically similar to galactose
D) a compound that cannot be transported into lacZ mutants
E) a compound that can only be transported into lacA mutants
Correct Answer:
Verified
Correct Answer:
Verified
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