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Microbiology, 2021

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104 3 • The Cell<br />

Figure 3.35<br />

An illustration of a generalized, single-celled eukaryotic organism. Note that cells of eukaryotic organisms vary greatly in<br />

terms of structure and function, and a particular cell may not have all of the structures shown here.<br />

Summary of Cell Structures<br />

Cell Structure<br />

Bacteria<br />

Prokaryotes<br />

Archaea<br />

Eukaryotes<br />

Size ~0.5–1 μm ~0.5–1 μm ~5–20 μm<br />

Surface area-tovolume<br />

ratio<br />

High High Low<br />

Nucleus No No Yes<br />

Genome<br />

characteristics<br />

• Single chromosome<br />

• Circular<br />

• Haploid<br />

• Lacks histones<br />

• Single chromosome<br />

• Circular<br />

• Haploid<br />

• Contains histones<br />

• Multiple chromosomes<br />

• Linear<br />

• Haploid or diploid<br />

• Contains histones<br />

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