Thames & Kosmos Kids First: Biology Lab handleiding
Handleiding
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12
Onion Skin and
Chloroplasts
DID YOU KNOW ?
A bacterial cell is just one thousandth of a
millimeter in size. That means that about 70
bacterial 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 cm in length. Giant cells like that are the
exception however.
CHECK IT OUT
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 this “prototypical” plant
cell under the microscope — a typical cell
with a large round cell nucleus. The living
portion of the elongated cells is surrounded
by a protective cell wall. The cytoplasm
(the substance filling the cells) of a white
onion is colorless. If you take a red onion,
you can see the deep purple cytoplasm
inside the cells.
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Kids First: Biology Lab |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 25924 MB |
