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What do you think you know? Mitosis and the cell cycle are identical processes. Agree/disagree? New cells come from previously existing cells. Agree/disagree? All radiation is harmful to humans. Agree/disagree? All plant cells are green. Agree/disagree? Plant and animal cells contain all the same organelles. Agree/disagree? Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. Agree/disagree? Cells, Tissues, Organs and Systems • Why should we study cells? • http://www.youtube.com/watch?v=gFuEo2ccTPA Cell Theory • The cell is the smallest unit of life. In other words, the cell is the basic living organism that shows the characteristics of living things. (What are the characteristics of living things?) • All living things are unicellular or multicellular. • All cells are created from existing cells through a process called cell division by which a cell divides into two new cells. Some Characteristics of Living Things Always remember "MR NIGER D" M=movement R=respiration N =nutrition I=irritability G=growth E=excretion R=reproduction D=death Plant and Animal Cells What do you know about: • Eukaryotic cells? • Prokaryotic cells? • Organelles? Organism With a nucleus No nucleus Eukaryote Prokaryote many cells one cell Multicellular organism Single-celled organism Animal e.g. E coli e.g. Amoeba e.g. whale Plant