Notebook Check
(counts as 10 pt. quiz)
10/9 - All/almost all papers together; newest on
top, oldest on bottom.
8/7 - More than a few papers missing or out of
order.
5/4 - Most papers missing, disorderly.
2 - Few papers present.
Should have at least 36 papers!
Order of papers, top to bottom
1. Cell biology
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Cell Transportation Stations
Cell Boundaries
Quiz: Cell Structures
Animal and Plant Cell labs
Cell Structures and Functions
2. Chemistry of Life
3. Ecology
4. Intro to biology, syllabus
Cell Biology Review
Learning Target:
Identify key ideas in cell biology you need to
study for test on Tuesday!
Good Morning! 
Please get a computer, log on, and
navigate to class website….
1. Explain what cells are and why they are important to learn about.
• Building blocks of life, what all living things are made of.
• Helps us better understand how our bodies work, how
living things work, help cure diseases.
2. Explain two key differences between prokaryotic and eukaryotic
cells. Give examples of each.
•
•
•
•
Eukaryotic cells have nuclei, prokaryotic don’t.
Eukaryotic cells bigger, more complex.
Prokaryotic: bacteria
Eukaryotic: animal, plant
3. Describe the function and importance of the following:
a. nucleus –
“brain” of the cell, controls cell activities and contains DNA.
b. DNA – Contains genetic information. Determines what you look like.
c. cell membrane – “skin” of the cell. Controls what goes in & out.
part of cell between nucleus & cell membrane. Where
d. cytoplasm – Liquid
most cell activities happen.
e. ribosome –
Make proteins.
f. mitochondrion – Breaks down sugar to release energy. “Powerhouse.”
g. chloroplast – Where photosynthesis happens in plant cells. How plants make
food (sugar).
h. cell wall - Thick outer covering of plant cells. Provides support and
protection.
4. Identify two cell structures found in plant cells but not in animal
cells. Explain why they are of particular importance to plants.
• Chloroplasts, cell wall.
• Without chloroplasts, plants couldn’t make own
food.
• Without cell walls, plants wouldn’t be able to grow
tall enough to reach sunlight.
5. Draw a simple animal cell diagram and label the following: nucleus,
DNA, cytoplasm, cell membrane, mitochondrion, ribosomes.
6. Draw a simple plant cell diagram and label the following: cytoplasm,
cell membrane, cell wall, mitochondrion, chloroplast.
7. Explain what photosynthesis
is and why it is important to all
life on Earth.
• The way plants use light
energy to make food in
the form of sugar
(glucose).
• Photosynthesis at
beginning of almost
every food chain on
Earth.
Hydrothermal vent
8. Describe the function of protein channels in the cell membrane.
Provide passageways for larger molecules to get through
cell membrane.
Protein
channel
9. Define diffusion. Give an example of how you may see diffusion
happen in your every day life….
• Movement of molecules from area of high concentration
to low.
• Fart diffuses through crowded room……
10. Define equilibrium. Give an example of how you may see
equilibrium in your every day life….
• Equal concentration of molecules all over.
• Fart spread equally throughout room……
11. Use words and pictures to explain why it is easier for glucose
molecules to get into cells than starch molecules.
Glucose (sugar) molecules small enough to fit through protein
channels. Starch molecules too big. Have to be broken down into
sugar.
starch
Glucose
(sugar)
12. Use words and pictures to explain how osmosis causes an
animal cell to change size in pure water and in salt water.
Pure water (100% water)
salt water (70% water)
80% water
80% water
Higher concentration
of water outside than
in, so more molecules
move into cell than go
out. This makes cell
swell (get bigger).
Higher concentration of
water inside than out,
so more molecules
move out of cell than in.
This makes cell shrink.
What’s the difference between osmosis and diffusion?
• Diffusion = movement
of molecules from
area of high
concentration to low.
Equilibrium
(equally
spread out)
Red food coloring diffuses through a glass of water
• Osmosis = diffusion of
water across a
membrane.
Water moves by osmosis from left to right
13. Explain the difference between active and passive transport in
cells. Give examples of each.
• Active requires energy from cells, passive doesn’t.
• Diffusion: passive.
• Moving stuff from low concentration to high: active.
passive transport.
1. Rolling ball downhill is like _________
2. Rolling ball uphill is like ____________transport.
Concentration gradient
Low concentration
High concentration
Cell membrane
passive transport.
1. Rolling ball downhill is like _________
2. Rolling ball uphill is like ____________transport.
Concentration gradient
High concentration
Low concentration
Cell membrane
passive transport.
1. Rolling ball downhill is like _________
active
2. Rolling ball uphill is like ____________transport.
Concentration gradient
Low concentration
High concentration
Cell membrane
passive transport.
1. Rolling ball downhill is like _________
active
2. Rolling ball uphill is like ____________transport.
Concentration gradient
Low concentration
High concentration
Cell membrane
Questions?
Water tends to move in or out of cells by osmosis in such a
way as to reach equilibrium (equal concentrations inside
and outside)
Osmosis Animation
http://highered.mheducation.com/sites/9834092339/student_vie
w0/chapter38/animation_-_osmosis.html
http://highered.mcgrawhill.com/sites/0072495855/student_view0/chapter2/animation_
_how_osmosis_works.html
Active or passive?
Questions?