E. coli cells grown on 15n medium are transferred to 14n medium and allowed to grow for two more generations (two rounds of dna replication). dna extracted from these cells is centrifuged. what density distribution of dna would you expect in this experiment?

a) one high-density and one low-density band

b) one intermediate-density band

c) one high-density and one intermediate-density band

d) one low-density and one intermediate-density band

e) one low-density band

Your answer would be D.

Hope this helps.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

your answer would be a, maximum exploitation of resources.