2. AP Biology 2007-2008 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 2007-2008 LE 6-23b 15 µm Direction of organism’s movement Motion of cilia Direction of active stroke Direction of recovery stroke

7. AP Biology 2007-2008 LE 6-24 0.5 µm Microtubules Plasma membrane Basal body Plasma membrane 0.1 µm Cross section of basal body Triplet Outer microtubule doublet 0.1 µm Dynein arms Central microtubule Cross-linking proteins inside outer doublets Radial spoke Activity: Cilia & Flagella

8. AP Biology 2007-2008 LE 6-25a Dynein “walking” Microtubule doublets ATP Dynein arm

9. AP Biology  actin  microtubule  nuclei Cytoskeleton

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

11. AP Biology 2007-2008 Any Questions??