The two molecules that make up the sides/ backbone of the dna double helix are

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.

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.