AP Biology Tour of the Cell 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

AP Biology Making New Cells

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

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

AP Biology LE 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

AP Biology LE 6-25a Dynein “walking” Microtubule doublets ATP Dynein arm

AP Biology  actin  microtubule  nuclei Cytoskeleton

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

AP Biology Any Questions??