2.1.2 Structure of prokaryotic cells and viruses
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6 Terms
Explain why viruses are acellular
They’re not made of cells and have no cell membrane, cytoplasm or organelles
Explain why cells are non-living
They don’t respire
Describe the general structure of a virus particle
Nucleic acids surrounded by a capsid
Attachment proteins allow attachment to specific host cells
No cytoplasm, ribosomes, cell wall or cell membrane etc
Some surrounded by a lipid envelope
What is an example of a prokaryotic organism?
Bacteria
Why is DNA in prokaryotic cells not enclosed in a nucleus?
Cytoplasm lacks membrane - bound organelles so genetic material isn’t enclosed in a nucleus
Describe the general structure of a prokaryotic cell
Cell - surface membrane
Cell wall
Cytoplasm
Small ribosomes
Circular DNA (free in cytoplasm and not associated with proteins)
In some:
Capsule
Plasmids (small rings of DNA)
Flagella
Note 
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