3.2.1.2 Structure of prokaryotic cells and of viruses
Prokaryotic cells are much smaller than eukaryotic cells. They also
differ from eukaryotic cells in having:
• cytoplasm that lacks membrane-bound organelles
• smaller ribosomes
• no nucleus; instead they have a single circular DNA molecule
that is free in the cytoplasm and is not associated with
proteins
• a cell wall that contains murein, a glycoprotein.
In addition, many prokaryotic cells have:
• one or more plasmids
• a capsule surrounding the cell
• one or more flagella.
Details of these structural differences are not required.
Viruses are acellular and non-living. The structure of virus particles
to include genetic material, capsid and attachment protein.
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