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Sheila just started working in a lab. She performed several plasmid isolations and used 2 uL of the eluted DNA solution to measure the absorbance (A) at 260 and 280 nm with a spectrophotometer. She calculated the ratio of A260/A280 and obtained the numbers shown below.Which of her five samples do NOT meet the purity standard of DNA? This is a multiple answer question, so evaluate each sample individually and decide.

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