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Cells (AQA AS Biology) PART 2 of 6 TOPICS
Structure of prokaryotic cells:
Prokaryotic cells are different to eukaryotic cells in many ways:
They are smaller to eukaryotes
They have no membrane-bound organelles
They have no nuclei but a loop of DNA
They have murein (a glycoprotein) in their cell walls
In addition prokaryotes have structures such as having more than one plasmids, a capsule surrounding
the cell and more than one flagella.
Viruses are a-cellular and are non-living. They have a protein coat with a nucleic acid in the middle
(DNA). It has an attachment protein which attaches to a cell.
NB: As part of AQA, only the illustration of complex and spherical viruses need to be known. Above
is a description of a complex virus and spherical is where HIV is under
which will be covered in later topics.
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