These IGCSE Biology Chapter 2 notes on Cells provide clear and concise explanations of all the key concepts and definitions from the textbook. Designed to be shorter and easier to understand, the document is ideal for students looking for a straightforward summary to support their learning and revi...
cells: the smallest unit from which all organisms are made
organelle: subcellular structure that has one or more speci c jobs to perform in the cell
all organisms are made of cells, new cells are made by the division of the existing cells.
, microscopes-
light microscope:
• shines light through the piece you are looking at , and uses
glass lenses to magnify and focus the image
• can magnify about 1500 times
• a photo taken using a light microscope is called a
photomicrograph
Electron microscope:
• can magnify up to 500000 times
• uses a beam of electrons to magnify
• pictures taken by it are called electron micrographs
Parts of a cell-
Cell membrane:
• on the outside of every cell
• is a very thin layer of protein and fat
• controls what goes in and out of the cell
• semi-permeable
• separates the contents of the cell from it’s environment
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