The A260/A280 ratio of a DNA sample was observed to be 1.2. An increase in this ratio can be obtained by subjecting the DNA sample to
(A) phenol extraction
(B) trichloroacetic acid treatment
(C) butanol extraction
(D) all of the above can be used
(A) phenol extraction
(B) trichloroacetic acid treatment
(C) butanol extraction
(D) all of the above can be used
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