The most direct proof for DNA being the genetic material was provided by genetic transformation. DNA is measured either in base pairs (bp) or spectrophotometrically: 1 unit of optical density (OD) of double-stranded DNA (at 260-nm wavelength) is about 50 μg/mL. One OD of single-strand DNA is about 40 μg/mL; 1 μg/mL DNA contains about 3.08 μM phosphate (DNA types); 3000 nucleotides are about 1 μm in length, 1 pg DNA is about 0.60205 × 1012 Da [10−12/(1.6661 × 10−24 g)]. DNA types. Watson and Crick model, hydrogen pairing, spectrophotometer, transformation, xDNA
deoxyribonucleic acid, the genetic material of all eukaryotes and bacteria and many viruses (see Fig. D63).
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