Download More concentrated solution OUTSIDE cell Less

2/2/12- Biology-Second Semester
Homework: Short Checkup on Monday on
Water Movement and Concentration.
Things to know:
1) Final exams are not being returned.
2) Come to tutorial if want to review your answers.
3) There will NOT be test corrections for the final exam.
4) Semester Grades will be posted by district due date of Feb
10.
5) Yes, grades start over today!
6) Today is the day to start a new logbook
7) New link at biology website
bellevuebiology.wikispaces.com
Make an entry:
Entry 1: EGG DEMO- 2/2/12
Answer the warm up questions below:
1. Why can’t a freshwater fish stay in
saltwater for a long time?
2. Why can’t a land plant be watered
with salt water?
3. Why can’t a saltwater fish stay in
freshwater for a long time?
No Salt
Lots of bacterial growth
Low Salt
High Salt
Some bacterial growth
Little bacterial growth
No Salt
Low Salt
High Salt
Why is Transport Important
to Living Things?
Think back: We eat food. So what?
How do the nutrients get from our
stomach/small intestine to our cells?
1. Cells must maintain a balance of water
and solute (things in the water)
2. Cells must be able to get all of the
materials necessary for it to survive and
function
3. Cells must be able to get rid of waste
products. (many of which are toxic)
In this unit we will learn:
1. HOW water and other molecules move into
or out of a cell
2. THE STRUCTURE of the cell membrane that
allows materials to pass in or out of the cell
Corn syrup
(Karo light)
Water
More concentrated
solution OUTSIDE
cell
More concentrated
solution INSIDE
cell
Less concentrated
solution inside cell
Less concentrated
solution outside
cell
Egg whites
Same
concentration
inside and
outside of cell
(CONTROL)
Corn syrup
(Karo light)
Water
Egg whites
More concentrated
solution OUTSIDE
cell
Less concentrated
solution inside cell
More concentrated
solution INSIDE cell
Less concentrated
solution outside cell
Same concentration
inside and outside
of cell
(CONTROL)
Before: 49.49 g
Before: 50.15 g
Before: 60.84 g
Corn syrup
(Karo light)
More concentrated
solution OUTSIDE
cell
Less concentrated
solution inside cell
After: 28.51g
Water
Egg whites
More concentrated
solution INSIDE cell
Less concentrated
solution outside cell
Same concentration
inside and outside
of cell
(CONTROL)
After: 75.36 g
After: 59.2 g
Corn syrup
(Karo light)
Water
More concentrated
solution OUTSIDE cell
More concentrated
solution INSIDE cell
Less concentrated
solution inside cell
Less concentrated
solution outside cell
Percent change
in size of egg
-_________
42.3%
Percent change
in size of egg
+50.2%
_________
Egg whites
Same concentration
inside and outside of
cell
(CONTROL)
Percent change
in size of egg
-2.6 %
_________
Based on these results,
which way does water
move? (don’t just say “out” or “in”)
Water moved toward the side that was more
concentrated (had more “stuff” in it)
In your own words:
• What does concentration mean? (in
terms of solutions)
• 10 ml of water compared to1 liter of
the same water – which is more
concentrated?
• 10g of salt in a liter of water compared
to 100g of salt in a liter if water—which
is more concentrated?