Figure 2.

Energetics of genome size in eukaryotes and prokaryotes. (A) Mean energy per gene in prokaryotes versus eukaryotes equalized for genome size. (Gray) Prokaryotes; (black) eukaryotes. Note the log scale. (B) Mean energy per gene in prokaryotes versus eukaryotes equalized for genome size and cell volume (see text). (Gray) Prokaryotes; (black) eukaryotes. Note the log scale. (C) Mean energy per gram in prokaryotes versus eukaryotes. (D) Power per haploid genome (energy per gene × number of genes in one haploid genome) in (lane a) Escherichia coli; (lane b) Thiomargarita; (lane c) Epulopiscium; (lane d) Chlamydomonas; and (lane e) Amoeba proteus. Note the log scale and broad agreement with derived mean values in A and B. (Figure based on data from Lane 2011a.)