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