Transcript Notes on cell biology

Cell Biology
Structure of plant cells:
Structure of Animal Cells:
LO: Describe the structure of plant and animal cells.
SLE: Meet NGSS
Checkpoint Quiz on Cell Structure:
1. Draw an animal cell, label the parts
(organelles), and describe what the parts do.
LO: Describe effect of temperature on diffusion rates
SLE: Work collaboratively.
Problem: How does temperature
affect the diffusion rate of food
coloring in water?
Hypothesis:
Independent variable:
Dependent variable:
3 Controls:
Procedure:
1. Put cold water in a beaker, add
2-3 drops of food coloring.
2. Time how long it takes the food
coloring to reach the edges of
the beaker.
3. Repeat with hot water.
4. Compare diffusion rates.
Data:
Water Temp. (C)
Cold 1
Cold 2
Cold avg.
Hot 1
Hot2
Hot avg.
Conclusion:
Diffusion Rate
(sec)
Movement of Nutrients Within and
Between Cells:
Within cells, most particles
move randomly through the
process of diffusion:
movement of particles from
areas of high concentration
to areas of low
concentration. When water
diffusion occurs through a
cell or nuclear membrane,
it’s called osmosis.
Diffusion and osmosis are
forms of passive
transport: no energy is
used to move nutrients
around.
If energy is used to move
nutrients (via proteins in
the cell membrane or by
Golgi bodies), it’s called
active transport.
In both plant and animal cells, nutrients are
usually brought into the cells, and waste
removed from cells, through active and passive
transport. (In animals, this is the only way that
cells get nutrients.)
Photosynthesis: How plant cells get energy.
6H2O + 6CO2  C6H12O6 + 6O2
Respiration: How cells use stored energy:
C6H12O6 + 6O2  6H2O + 6CO2
Homework:
LO: Describe how cells get and use nutrients and
energy.
SLE: Articulate ideas clearly and effectively.
1. Read p. 34-41
2. Respond to questions on p. 41
LO: Describe the effects of salt concentration on
cellular osmosis.
SLE: Work collaboratively.
Problem: How does the salt content of water
affect the rate of water absorption in plant
cells?
Hypothesis:
Independent variable:
Dependent variable:
3 Controls:
Procedure:
1. Get two potato slices
2. Measure the mass of each potato slice.
3. Place one half of the potato in a beaker of
salt water, and the other in a beaker of fresh
water.
4. Wait two days.
5. Find the mass of each potato half again.
6. Make qualitative observations.
Data:
Mass of
slice (g)
Before:
After:
In Fresh
water
In salt water
Qualitative observations:
Conclusion: