#2.1.2.1
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.
#2.1.2.2
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.
#2.1.2.3
Viruses are acellular and non-living. The structure of virus particles to include genetic material, capsid and attachment protein.