Which prevents the lac genes in the dna of e. coli from being expressed most of the time

The Lac repressor prevents the Lac genes in the DNA of E.coli from being expressed most of the time.

Hope this helps!

-Payshence

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

b is dominant over the allele for the white fur.