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BACTERIA

Source:Bacteria.wikipedia,the free encyclopedia

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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