B1 cells and transport

Eukaryotic and prokaryotic cells:

The two different types of cells are eukaryotic cells and prokaryotic cells.

The similarities are that they both have a cell membrane, cytoplasm and ribosomes.

The differences are that prokaryotic cells have a DNA loops instead of a nucleus. A prokaryotic cell also has a flagellum, tails like structure that allows the cell to move as well as a plasmid which contains DNA and controls specific functions.

Eukaryotic cells have a nucleus, mitochondria, a vacuole, chloroplasts and a cell wall.

Microscope:

• The eyepiece lens makes the image 10 times bigger than real life.

• The objective lenses are three lenses of different strengths which can be uses to look at the slide in more detail.

• The stage is the place you put a microscope slide.

• The diaphragm controls the amount of light.

• The light projects light onto the microscope slide.

• The base keeps the microscope steady.

• The arm holds the eyepiece lens above the stage.

• The fine focus knob is used to get the microscope into focus so the image is very sharp and clear.

• The coarse focus knob is used to get the microscope slide into focus so that you can see the image more clearly.

Image size = actual size / magnification