L05a - NATS1610-fw1718 - Cell Basics.pdf

Is the structural and functional unit of all known

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is the structural and functional unit of all known living organisms Edmund Beecher Wilson (1856–1939) famous cell biologist n "Long ago it became evident that the key to every biological problem must finally be sought in the cell; for every living organism is, or at some time, has been a cell. " n From: “The Cell in Development and Heredity”, Macmillan, Inc., 1925 edition) n For online version of the second edition (1900) of this book – see: n Anything that is alive is made up of cells n Unicellular, multicellular organisms n Humans are made of literally trillions of cells n Most cells are so small that they can only be seen though a microscope Image - by Edmund Beecher Wilson [ Public Domain ], via Wikimedia Commons Fig. 2 from E.B. Wilson’s Cell, 2ed – onion root-tip cells
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7 Stop and Consider Close your eyes and imagine that you’re a single cell. n Describe yourself. n Where are you? n What are you doing? n What’s around you? n What’s happening around you?
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8 The Cell is the SMALLEST entity capable of displaying ALL the attributes that CHARACTERIZE LIFE n Organization n Acquiring and using energy n Metabolism n Stimulus sensing and response n Growth and reproduction n Evolution Fig. 9.11 - from Starr and Taggart, Biology: The Unity and Diversity of Life , 9ed, Brooks/Cole
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LIKE THE BODY n Cells display a HIERARCHY OF MOLECULAR ORGANIZATION n Atoms to Molecules n Macromolecules n Amino acids, sugars, polysaccharides, proteins, nucleic acids, etc... n Supramolecular complexes (larger molecular structures within cells) n Ribosomes, cytoskeleton, enzymes, etc n Membranes that define cell/organelle boundaries n Organelles (small organs) – ER, Golgi, etc n The Cell 9 Fig. 1.8 – From Garrett and Grisham “Biochemistry”, 1 st Canadian Edition, Nelson
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  • Spring '14
  • Metcalfe,Robin
  • cells, Microscopy and Cells

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