1.1 Introduction to Cells

1.1 Introduction to Cells

1. Application

   • Paramecium vs Chlorella

2. Nature of Science

   • Looking for trends + discrepancies
     • Cell theory
       • All organisms are composed of one or more cells
         • Becoming multicellular
           • Surface area to volume ratio
           • Emergent properties
             • Differentiation
               • Stem cells
                 • Therapeutic use
                   • International mindeness
                     • National governments are influenced by local, cultural and religious traditions that impact on the work of scientists and the use of stem cells in therapy
                       • Aim 8
                         • Ethical issues
                           • Umbilical cord
                           • Adult`s own tissues
                     • Stem cell research has depended on the work of teams of scientists in many countries who share results thereby speeding up the rate of progress
                       • Application
                         • Treat Stargardt’s disease
       • Cells are the smallest unit of life
         • Microscope
           • Magnification = Size of image size of object
             • Drawing a cell
           • Scale bar
             • 1cm = 10mm = 10 000um
             • 1um = 0.001mm = 0.1cm
       • A cell can perform all the functions of life
         • Metabolism
         • Growth
         • Response or Sensitivity
         • Homeostasis
         • Nutrition
         • Reproduction
         • Excretion
       • Cells can only come from pre-existing cells
       • Exceptions
         • Aseptate fungal hyphae
         • Striated muscle
         • Giant algae
         • Red blood cell

3. TOK

   • Living and non-living environment