Download Ap Cell 3

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
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Making New Cells
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2007-2008
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
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Cytoskeleton
 actin
 microtubule
 nuclei
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Centrioles
 Cell division

in animal cells, pair of centrioles
organize microtubules
 spindle fibers

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guide chromosomes in mitosis
Any Questions??
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Microtubule or Microfilament
 Explain the structure and functions of
Front row: microtubule
 Back row: microfilament

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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
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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
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muscle contraction.