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Department
Biology
Course
BIOL 120
Professor
Simon Cheung
Semester
Winter

Description
Lecture 1 Importance of plants:  Photosynthesis sustains life on earth - oxygen release, energy via food chains, organic compounds)  Important food source  Medicine come from plants - about 255 of all pharmaceuticals are made from plant extracts  Plants provide a variety of useful products - fuel, shelter, paper, food, biofuels, etc.  Valuable resource for remediation, enhancing quality of life, and scientific discovery Organisms are made up of cells  1.  All living organisms are made up of one or more cells\  2.  Cells are typically 1-300 µm in diameter (1 µm is equal to 1/1000 of a mm)  3.  Cells were discovered by Robert Hooke (1635-1703)  4.  Hooke used the term “cell” because the tiny compartments making up the slice of bark reminded him of a monk’s cell  5.  “Cell” Latin, cellula , meaning “small room” Cell Size  Cell size is limited by a need to maintain a surface area that will allow for exchange of oxygen, water and nutrients for a given volume  Microscopes aid in visualization of structures beyond the resolution of the human eye. Light (visible light - power only up to 200nm) and electron microscopy are used to enhance resolution. Plants are composed of cells  In the mid-1800s a general theory emerged about the nature and significance of cells  In 1838, German botanist Matthias Schleiden concluded that microscopic studies confirmed that plant parts are composed of cells (cell walls made it easy to identify individual cells)  Not until a year later did German biologist Theodor Schwann confirmed that animals are also composed of cells Cell Theory  The cell is the basis of an organism’s structure and reproduction 1.  Organisms are made up of one or more cells 2.  A cell is the basic unit of structure for all organisms Lecture 1 3.  Cells arise only from existing cells Prokaryotic or Eukaryotic  First forms of life on earth were prokaryote
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