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•Looked at a cork and it reminded him of a ‘cell’ of a Monastery. •He called them the building blocks of life. “ALL LIVING THINGS ARE MADE OF CELLS AND CELL PRODUCTS” Early scientists had trouble understanding the origins of living things. They believe in the theory of ‘spontaneous generation’ whereby living things could emerge from non-living matter. For example, flies or rats could be created from rotting garbage. Louis Pasteur put an end to this theory and suggest that ONLY LIVING THINGS COULD COME FROM LIVING THINGS! Rudolf Virchow refined Pasteur’s idea into a new theory. EVERY CELL COMES FROM A CELL Virchow’s Theory: Virchow’s theory suggests that we all have a touch of immortality. The cells in your body come from genetic information passed down to you by your parents, ancestors and so on… Part of you has been alive since the very first human!!! We accept Virchow’s theory as ‘true for now.’ Cells are unicellular and multicellular Size from 5 to 50 Microns: piece of paper is 75 microns (millionths of a metre) Cell shapes include: cubes, spheres, doughnuts, columns, balloons, rods, pancakes, hearts, corkscrews, etc… Humans have on average 100 Trillion cells 155,000 cells in cm3 Brain has 30 billion brain cells! You cannot grow more. Your blood has 20 trillion red blood cells. 2 KINDS of cells: 1) PROKARYOTIC: this type of cell has no nucleus or membrane bound organelles within it. Genetic material is spread throughout the cell. Examples: BACTERIA and ALGAE Sometimes these cells are called MONERANS 2) EUKARYOTIC: All other living organisms (plants, animals, fungi and protists) are composed of eukaryotic cells. These cells have a nucleus and membrane bound organelles. There are many organelles inside a cell that we can look at further.