What happens to e. coli when lactose is not present?

a. the enzymes needed to break down lactose are continually produced.
b. the genes that produce the enzymes needed to break down lactose are not expressed.
c. e. coli is not able to survive without lactose.
d. the genes required to produce the enzymes that break down lactose are destroyed.

The genes that produce the enzymes needed to break down lactose are not expressed.

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

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