In E. coli the lac operon is used to control the expression of the genes involved in the use and metabolism of lactose. Under which condition would the lac structural genes be expressed

answer: that would be cheating

explanation:

the answer is "a.) well–developed vascular system."

explanation:

there is not 1 highest source of protein, but there are many; meats, fish, poultry, seafood, cheese, eggs, yogurt and milk. the only non complete animal food that is beneficial is gelatin.

sorry if this did not , have a great day!