After 12 hours of incubation, how many copies/g of sediment of the 16S rRNA gene are there of the SN2 strain in the TF-N condition?
The bacterial strain SN2 (Alteromonas naphthalenivorans) is known to contaminate both tidal flats and seawater. The graphs in Figure 1 show the results of an experiment intended to measure the cell growth of SN2 in a tidal flat environment with added Naphthalene (TF-N) and a tidal flat environment with added Pyruvate (TF-P). The concentration of Naphthalene and Pyruvate were also measured within this experiment. Additionally, changes in the optical density of seawater was measured when both Naphthalene and Pyruvate were added. The goal of this experiment was to better understand the Eco physiological behavior of SN2 in contaminated environments. The graphs in Figure 2 depict levels of correlation in level of gene expression between conditions.
Figures adapted from Genome-wide transcriptional responses of Alteromonas naphthalenivorans SN2 to contaminated seawater and marine tidal flat sediment by Hyun mi Jin et al.
(C) There are between 107 and 108 gene copies/g of sediment of SN2 in both conditions after the 12-hour timestamp. Consider only the top graph. The trend in Pyruvate and Naphthalene concentrations should be ignored given the question inquires about SN2 specifically. The solid lines indicate change in their concentrations.