PLASTIDS: include chloroplast with stroma and grana
(animation),
leucoplast, chromoplast
CELL WALL
CELL MEMBRANE: include these parts: the phospholipid
by-layer and protein channels.
Note: Technically,
organelles are lipid membrane-bound. This would
include the nucleus, mitochondrion, Golgi apparatus,
lysosomes, plastids, vacuoles, and ER. Other important
structures are not membrane-bound: ribosomes, centrioles,
cytoskeleton (microtubules, microfibers), flagellum, and
cell walls. So, some sources distinguish between these
two as membrane-bound organelles
and nonmembrane- bound organelles.
The Molecular Workbench site is designed to
simulate many scientific principles. It is an
excellent way of seeing what goes on with various processes
like cellular
respiration, diffusion,
DNA to protein, lipids and carbs, proteins and nucleic
acids,
harvesting light (photosynthesis), ELISA, and the tree of
life.
Click on the DIFFUSION
simulations, change the concentrations of oxygen or CO2
in a membrane, and predict the outcome...
If the concentration of solute (salt) is equal on
both sides of a semi-permeable membrane, the water
will move back in forth but it won't have any result
on the overall amount of water on either side.
"ISO"
means the same
The word "HYPO" means less, in this case
there are less solute (salt) molecules outside the
cell; water will move into the cell.
The cell will gain water and grow larger. In plant
cells, the central vacuoles will fill and the plant
becomes stiff and rigid (turgor pressure); the cell
wall keeps the plant from bursting
In animal cells, the cell may be in danger of
bursting (lysing). CONTRACTILE VACUOLES
will pump water out of the cell to prevent this.
The word "HYPER" means more, in this case
there are more solute (salt) molecules outside the
cell, which causes the water to move in that
direction.
In plant cells, the central vacuole loses water and
the cells shrink, causing wilting. The cell
membrane can pull away from the cell wall as the
cell loses water, called PLASMOLYSIS.
In animal cells, the cells also shrink.
In both cases, the cell may die.
This is why it is dangerous to drink sea water - its
a myth that drinking sea water will cause you to go
insane, but people marooned at sea will speed up
dehydration (and death) by drinking sea water.
This is also why "salting fields" was a common
tactic during war, it would kill the crops in the
field, thus causing food shortages.
Active Transport (requiring ATP Energy to go
against conc. gradient).
Save this Word doc to your desktop first, then
work on it. Print it at the end of the lab session,
along with an image related to your cancer. You
will research TWO cancers that interest you most (2
forms).