The obvious advantage of the lac operon is that it ________________________.

A. allows bacteria to survive in the presence of lactose
B. eliminates the need for lactose-metabolizing enzymes when lactose is not present
C. enables bacteria to make lactose only in the presence of the proper enzymes
D. negates the need for milk in the diet of adult humans
E. enables glucose to substitute for lactose in the diet of lactose intolerant persons


Answer: B

Biology & Microbiology

You might also like to view...

Which of the following involves an increase in entropy?

A) hydrolysis B) reactions that join monomers C) polymerization D) chemical evolution

Biology & Microbiology

Mendel's laws

A) do not apply to multifactorial traits. B) apply to multifactorial traits but may be difficult to follow because the genes contribute only partly to a trait. C) operate in some genes that contribute to a multifactorial trait, but not in others. D) apply only to polygenic, but not multifactorial traits.

Biology & Microbiology

What is a hapmap?

What will be an ideal response?

Biology & Microbiology

The waxy polymer on the leaves of vascular plants that protects them from pathogens is called

A. cutin. B. cellulose. C. chitin. D. sporopollenin. E. lignin.

Biology & Microbiology