Thames & Kosmos Kids First: Biology Lab (V 2.0) handleiding
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13
Plant Cells
Onion skin
cells
An onion is composed of
many layers, with each
individual layer covered by a very thin skin. This
skin has a silvery sheen and consists of just a
single layer of cells. You can easily view these
plant cells under the microscope. Onion skin
cells are a good example of common plant cells.
They have a large, round cell nucleus and are
surrounded by a solid, protective cell wall. The
cells are filled with a liquid called cytoplasm.
In red onions, the cell wall and cytoplasm are
colored reddish-purple by a natural dye. In
common white onions, the cell components
appear colorless to slightly yellowish under the
microscope.
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A bacteria cell is just one thousandth of
a millimeter in size. That means
that about 70 bacteria cells
placed side by side will be
about as thick as a hair! At the
other extreme, the egg cell of an
ostrich is a veritable giant, measuring 15
centimeters in length. Giant cells like that
are the exception however.
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Kids First: Biology Lab (V 2.0) |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 24679 MB |
