Cell Size

1
Cell Size

• From Smallest to largest
• Prokaryotic Cells

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Size Comparison
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Kind of CellSize (approximate)

• Bacteria(E. coli) 1 um
• Red Blood Cell 8 um
• Elodea epidermal cell 65 um
• Amoeba 700 um
• Hen's egg 50,000 um

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Smallest Cells

• Mycoplasmas bacteria 0.1 -1.0 µm

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Largest Cells

• Ostrich Egg
• Chicken Egg

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Metrics

• 1 cm 0.01 m (10-2)m
  centimeter
• 1 mm 0.001 m (10-3)m millimeter
• 1 µm 0.000 001 m (10-6)m micrometer
• 1 nm 0.000 000 001 m (10-9)m nanometer
• 1 Å 0.000 000 0001 m (10-10) Angstrom

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Longest Cells

• Muscle and Nerve Cells

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Form and Function

• Nerve
• Long to
  send
  impulses

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Form and Function

• Muscle
• Move bones

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Form and Function

• Blood Cells
• Smooth, travel through blood vessels

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Form and Function

• Skin Cell
• Flat top for protection
• Cube for cushion

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• As cells get larger, the surface area to volume
  ratio ______________________ (increases/decreases)
  .
• decreases

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Prokaryotic Cells
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Contrasting Nucleoid and Nucleus
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Which are bigger?

• Prokaryotic cells 0.2- 2µm in size
• Eukaryotic cells 10- 500µm in size

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Cocci (spherical)
Bacilli (rod)
Spiral
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Cyanobacteria
Note the color green
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Bacteria Capsule
Sticky to adhere to surfaces
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Prokaryote flagella
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Swimming Bacteria
How Bacteria Swim (animation link) and also one
at bottom