3) You have four tubes containing thesame DNA at the sameconcentrationin each tube (pH 7.5) but underdifferent environmental conditions (listed below).  TheTMfor this DNA molecule is 78°C at physiological saltconditions (~100 mM NaCl):
- DNA in an aqueous solution that has been digested completely tonucleotideswith DNAse I enzyme.
- DNA in an aqueous solution containing no salt and has beenheated to 78°C.
- DNA in an aqueous solution containing physiologicalconcentrations of salt and heated to 78°C.
- DNA in an aqueous solution containing physiologicalconcentrations of salt and is heated only to 37oC.
Match the samples above with theircorresponding OD260readings.  Next,explain your reasoning for each of the matches youmade.  (For example, “The DNA in sample (a)gives the highest OD reading because…â€).
