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Prokaryotic v.s. Eukaryotic Cells

Prokaryotic cells: the smallest, simplest cell type. The DNA is not housed within a nucleus.
These cells also have no chloroplasts or mitochondria. They do usually have
cell walls. Bacteria and archaebacteria are the only prokaryotic organisms.

Eukaryotic cells
: a larger, more complex cell type unique to plants, animals, fungi, and protists.
The DNA is housed within a nucleus. Chloroplasts and mitochondria are found in eukaryotic
cells, though only plants and some protists will have chloroplasts (which are used for making food).

Touch mouse to pictures to enlarge to 400x. Note size difference between prokaryotic and eukaryotic cells, and between animal and plant cells.
Prokaryotic cells
Eukaryotic cells
A. Bacteria cells at 100x total magnification.
B. Human cheek cell at 100x total magnification.
C. Onion skin cells at 100x total magnification.