Fig. 2.

Electron micrographs of thin sections of Streptomyces coelicolor and Bacillus subtilis showing the very similar cellular architecture of these two prokaryotes. (V = vacuoles left when storage compounds in the germinating spore have disappeared; N = DNA of the genome – note the absence of a nuclear envelope separating it from the cytoplasm, M = mesosomes – membranous bodies carrying out the functions of eukaryotic mitochondria (these are also found in bacilli but not seen clearly in this section). From Figure 3.06 of Hopwood (2007), reproduced by permission of Oxford University Press