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Cells “The Building Blocks of Life” What is a Cell? • The structural and functional units of all living organisms. • What is a theory? – A set of statements or principles devised to explain a group of facts or phenomena – Based on limited information or knowledge – Verified of falsified through experimentation Cell Theory 1) All living things are composed of cells 2) Cells are the basic units of structure and function in living things 3) All cells come from pre-existing cells Exceptions: Viruses - Not composed of cells - Cannot survive without a host More about cells… • Cells fall into two categories – Eukaryotes – Plants, animals, fungi • Cells that contain organized nuclei – Prokaryotes - Bacteria • Cells that contain a non-organized nuclei Eukaryotic Cell Structure 2 Types Plant Animal Found only in plants The major parts found in both Nucleus Contains DNA Cell Membrane Allows materials to enter and exit ER Contain Ribosomes Produce Membrane lipids Ribosome Makes Protein from amino acids Mitochondria Makes energy Cell Wall Provides support Chloroplast Carry out Photosynthesis
