2007-2008 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

2007-2008AP 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

2007-2008 AP Biology

LE 6-23b

15 µm

Direction of organism’s movement

Motion of cilia

Direction ofactive stroke

Direction ofrecovery stroke

2007-2008 AP Biology

LE 6-24

0.5 µm

Microtubules

PlasmamembraneBasal body

Plasmamembrane

0.1 µm

Cross section of basal body

Triplet

Outer microtubuledoublet

0.1 µm

Dynein arms

Centralmicrotubule

Cross-linkingproteins insideouter doublets

Radialspoke

Activity: Cilia & Flagella

2007-2008 AP Biology

LE 6-25a

Dynein “walking”

Microtubuledoublets 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

2007-2008 AP Biology

Any Questions??