Which one of the following accurately describes the lac operon?
a. the repressor protein binds to the operator when lactose is present.
b. the repressor is freed from the operator when lactose is present.
c. rna polymerase transcribes the lac genes when lactose isn't present.
d. rna polymerase is prevented from transcribing the lac genes when lactose is present.

What are two ways in which waves erode the land?

Which type of bond forms between water moleculesstrong bondhydrogen bondcovalent bondpolar bond

Residential construction is expanding in florida, the expansion has caused fragmentation of habitats, one of the results of the increased construction is a decrease in the number of large predators such as the coyote, black bear and pool panther, which will be the most immediate local result of this fragmentation? 1)large predators will become extinct 2)decrease in middle sized predators 3)increase in population of top carnivores 4)increase in population of prey species