Maria Egidos
BACTERIA
Source:Bacteria.wikipedia,the free encyclopedia
Maria Egidos
Are bacteria larger or smaller than eukaryotic
cells?
smaller!
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Which is the bacteria, E.coli or Paramecium?
Look at these photos and say which cell is larger. Notice the scale.
2 µm 50 µm
E.coli Paramecium sp
E. coli Why?
Pictures source: oldearth.wordpress.com/microbios-en-accion;www5.pbrc.hawaii.edu/microangela/param.htm
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And now, which cell is larger? Notice the scale.
2 µm 2 µm
Eukaryotic cell Prokaryotic cell
Pictures source:Bacteria.wikipedia,the free encyclopedia;www.biochemistry.blogspot.com
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How many times smaller is this
bacterium than the eukaryotic cell?
Source:www.star.ucl.ac.uk
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So, one difference between bacteria and eukaryotic cells is size:
Cell Size
Bacteria Eukaryota
smallerlarger
More differences? Yes, the nucleus!
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Bacteria have prokaryotic cells. This meansthat they don't have nuclear membrane.
Prokaryotic cell Eukaryotic cell DNA
nuclear membrane
2 µm2 µm
Pictures source:Bacteria.wikipedia,the free encyclopedia;www.biochemistry.blogspot.com
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So, what is the difference between prokaryotic and eukaryotic cells?
Cell Size Nucleus
Prokaryotic
Eukaryotic
Small
Big
No nuclear membrane
Nuclear membrane
More differences? Yes, the complexity.
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Look inside of these cells. Which is more complex?
2 µm 2 µm
Photo source: wikipedia, the free encyclopedia
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Then, the differences between prokaryotic and eukaryotic cells are:
Cell
Prokaryotic
Eukaryotic
? ?Size? Nucleus Complexity
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