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Structure of prokaryotic cells and of viruses
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Samuel Bulmer
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Cards (3)
Describe the general structure of prokaryotic cells
Always present:
Cell-surface membrane
Cell
wall
- contains murein/
peptidoglycan
(Glycoprotein)
Cytoplasm
70s
ribosomes
Circular
DNA
- free in cytoplasm and not associated with proteins
Sometimes present:
Slime
capsule
Plasmids
- Small rings of
DNA
Flagella
Explain why viruses are described as acellular and non-living
Acellular - not made of
cells
, no
cell membrane
/
cytoplasm
/
organelles
Non-living - have no
metabolism
, can't
independently move
/
respire
/
replicate
/
excrete
Describe the general structure of a virus particle
1)
Nucleic acids
surrounded by a
capsid
(
protein coat
)
2)
Attachment proteins
allow
attachment
to
specific host cells
3)
No cytoplasm
,
ribosome
, cell
wall
,
cell
-surface membrane etc.
4)
Some
also
surrounded
by a
lipid envelope
e.g.
HIV
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