Discussion Advantages of Nanodrop over cuvette based spectrophotometry is that it is capable of measuring very concentrated samples without dilution it is 50 times higher than measurements by standard cuvette based spectrophotometry. Also it has a sample retention technology that uses only surface tension to hold the sample thus there is no need in cuvettes. Cheek cell DNA extraction is the extraction of the genomic DNA; therefore, it is easier to isolate the whole genomic DNA because it is just needed a good lysis step to release genomic DNA. Whereas, extracting plasmid DNA is a bit more complicatd because it requires separating plasmid from the genomic DNA. In addition, in isolating genomic DNA, chewing the cheeks was the primary method of cell lysis (physical) whereas in plasmid extraction SDS-alkaline method was applied for the lysis. Culturing bacteria for 16 hours is optimal as it is the transition from logarithmic into stationary growth phase. At this time, the ratio of plasmid DNA to RNA is higher than during the logarithmic phase. If culturing last longer, DNA might be degraded due to over aging of the culture in the later stationary phase.