An Introduction to Cell Biology
|Magnified Skin Cells|
The environment outside of the cell and the inside of the cell are separated by the cell membrane. Inside some cells, some parts of the cell stay separate from other parts by membranes. These separate parts are called organelles (like small organs). They each do different things in the cell. Two examples are the nucleus (where DNA is), and mitochondria (where usable energy is created).
Ignore the pink shirt, and find out more with this short video:
Our teacher discusssed eukaryotic cells. What are they?
There are two basic kinds of cells: prokaryotic cells and eukaryotic cells.
- Prokaryotes, bacteria and archaea, are simple cells with no internal organelles.
- Eukaryotes are complex cells with many compartments within the cell. Eukaryotes store their genetic information (DNA) in a compartment called the nucleus.
Advanced students may like to read further about how proteins are used by both animals and plants in cells with this course from the UK Open University.
You can prepare for your school biology assessment using the test resources from Cambridge University Press.
There are two kinds or eukaryotic organisms:
- Unicellular organisms are made up of one cell. An examples of a unicellular organisms is the Amoeba. Unicellular organisms live without other cells to help them.
- Multicellular organisms are made from many cells. They are complex organisms. This can be a small number of cells, or millions of cells. All plants and animals are multicellular organisms.