Cells Everywhere

By Mabel Malloy 7C

What is cell theory?

In biology cell theory is a scientific theory, that describes the properties of cells, the basic unit of structure in every living thing. All cells come from pre-existing cells and all living organisms have cells.

What is a cell?

A cell is a structural and functional unit in all living organisms. Some organisms, such as bacteria are unicellular which means, it is made of a single cell and depends or relies on that one cell. The rest of the organisms, such as humans are multicellular which means that, the living thing has many cells. They estimate that a living thing, such as humans have 100,000,000,000,000 cells.

What is the difference between an animal and a plant cell?

A difference between them is an animal cell has a cell membrane and doesn't have a cell wall but, a plant cell has both. Animal cells have a cilia and a plant cell rarely has a cilia. Animal cells don't have a chloroplast as for plant cells have chloroplasts because they make their own food. in animal cells lysosomes occur in cytoplasm and in plant cells lysosomes are usually not evident. Their shape is also different, animal cells are round and irregular. The shape of a plant cell is rectangular and it is a fixed shape. The reason why animal and plant cells have different shapes is because...

ANIMAL CELL

PLANT CELL

What are Microscopes?

The different types of microscopes that scientists use are the Compound Light Microscope, the Stereo Microscope, the Digital Microscope, the USB Computer Microscope, the Pocket Microscope, the electron Microscope and the Scanning Probe Microscope (SPM).

What is the difference between a wet and dry mount slide?


The procedure for a wet mount:

  1. Place a drop of water on the centre of the slide. It is also possible to first place the sample on the slide, but small samples usually separate more easily from the tweezers or needle if dipped into the drop of water.
  2. Place the sample into the drop of water and if the sample floats, add another drop of water on top of it. This decreases the chances of air bubbles forming.
  3. Carefully lower the cover glass so that it touches with one side the drop of water. The cover slip should form an angle of about 45° with the slide. Touch the cover glass on the sides only to prevent finger prints. Alternatively, use tweezers to hold the cover glass.
  4. Then lower the cover slip completely. Placing the cover slip at an angle that prevents the formation of air-bubbles.
  5. Remove excess water with a filter paper/tissue paper.