2. AP Biology Tour of the Cell 3

3. AP Biology Cells gotta work to live!  What jobs do cells have to do?  make proteins  proteins control every cell function  make energy  for daily life  for growth  make more cells  growth  repair  renewal

4. AP Biology 2007-2008 Making New Cells

5. AP Biology Cytoskeleton  Function  structural support  maintains shape of cell  provides anchorage for organelles  protein fibers microfilaments, intermediate filaments, microtubules  motility  cell locomotion  cilia, flagella, etc.  regulation  organizes structures & activities of cell

6. AP Biology  actin  microtubule  nuclei Cytoskeleton

7. AP Biology Centrioles  Cell division  in animal cells, pair of centrioles organize microtubules  spindle fibers  guide chromosomes in mitosis

8. AP Biology Any Questions??

9. AP Biology Microtubule or Microfilament  Explain the structure and functions of  Front row: microtubule  Back row: microfilament

10. AP Biology True or False?  Microfilaments are constructed of a globular protein called tubulin.  All eukaryotic cells have microtubules.  Microtubules serve as tracks on which other organelles can move.  Actin is a microfilament.  Microfilaments are hollow while microtubules are solid

11. AP Biology True or False?  Microtubules are built to resist compression while microfilament are built to bear tension and pull.  Microtubule structures help cell motility as cilia or falgella.  Microfilaments help cell motility as psuedopodia.  Microtubules form the cleavage furrow for cell division.  Microfilaments are responsible for muscle contraction.