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Revision for AS OCR Biology ­ Topic 3 (Cell Division, Cell Diversity and Cellular Organisation)

Cell cycle is the process by which all the cells in a multicellular organism grow and divide.
Interphase is the growth stage and mitosis is the division stage.
Mitosis only occupies a small percent of…

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Flexible shape allows it to engulf unwanted bacteria and pathogens.
Lots of lysosomes in cytoplasm which contains digestive enzymes to break down unwanted bacteria
and pathogens.
Epithelial cells
Epithelial cells line a surface for example in the trachea.
Some epithelial cells like in the lungs have cilia on them…


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