Warm-Up #13 11/15/12
1)
If the concentration of solutes in
a cell is LESS than the
concentration of solutes in the
environment, then the fluid in
the environment is said to
be____.
2) Cholesterol within the
membrane helps it to stay______.
3) Which solution pictured is
Isotonic?
4) This diagram represents what
type of transport?
Unit 4 Review Sheet
• We will go over the answers now
• Correct any you got wrong and take it
home to study tonight
1) Draw and label a cell membrane that
includes the following components:
–
–
–
Phospholipid molecules
Cholesterol molecules
Protein molecules
•
•
–
Channel
Carrier
Carbohydrate markers
2) What molecule makes up a lipid bilayer?
- phosphate heads and fatty acid (lipid)
tails= Phospholipids!
3) Describe what makes up the lipid bilayer
- Phospholipids, Proteins, Carbohydrates
and cholesterol
4) Draw and label a phospholipid molecule
that has a saturated and an unsaturated
fatty acid chain. Label the head and tails
and tell which are hydrophilic and
hydrophobic, water soluble and water
insoluble.
5) In what direction does diffusion always
go?
- From High to Low concentration
6) Describe concentration gradient.
- Amount of a solution in and outside of a
cell. How the solution moves.
7) Simple diffusion uses what part of the cell
membrane? Describe some molecules that
can use this process to pass through the cell
membrane.
- Uses phospholipids and channel proteins.
Water, Oxygen, CO2
8) Describe the differences between carrier and
channel proteins and explain when they might
be used.
- Channel proteins are always open and used in
passive transport. Carrier proteins open and
closed with the input of energy (active
transport)
9) Would simple diffusion or facilitated
diffusion be the process needed to move
an amino acid across the cell
membrane? Explain why you chose your
answer.
- Facilitated Diffusion, amino acids are too
big to get thru membrane without help
10) What are two main differences between
passive and active transport.
- Passive= no energy, High to low
- Active = needs energy, low to high
11) Explain what process might happen if a
white blood cell comes in contact with a
bacterium.
- Engulf it, Endocytosis (phagocytosis)
12) What does the Golgi apparatus package
proteins or hormones for secretion in?
- vesicles and releases it at the
membrane (exocytosis)
13) Diffusion of water happens so often that
it has its own name—what is it?
- OSMOSIS
14) If you put a carrot into a salt water
solution, what will happen to the carrot
cells? Will they shrink or burst? Explain
your answer.
- Plasmolysis, cell would shrink because
it is loosing water. (Hypertonic solution)
15) Why are the solutions used in medical
treatments isotonic? What would happen
if you received an intravenous fluid that
was hypotonic?
- To maintain homeostasis, A hypotonic IV
solution would cause cells to swell and
burst
16) Draw a picture of a red blood
cell in a hypertonic solution
17) Draw a picture of a plant cell in a
hypotonic solution.
18) Define turgor pressure and plasmolysis
with regard to plant cells.
- Turgor pressure= cell wall swells
-Plasmolysis= Cell membrane shrivels
away from the wall
19) Which structures in plant and bacterial
cells protect them from the effect of
osmotic pressure?
- Cell wall, hard protein covering
20) Draw a Venn diagram that compares
and contrasts passive and active
transport.
21) What is endocytosis? What are the two
types?
- Bringing food, materials into the cell.
Phagocytosis and pinocyctosis.
22) What is exocyctosis? How is it different
from endocyctosis?
- Exocytosis removes waster and
materials form the cell, ednocyctosis
brings them in
23) In what direction does water move in a
hypertonic solution? A hypotonic
solution?
- hypertonic= water moves out
- hypotonic= water moves in
24) What makes up the fibers in the cell wall
that allow it to be slightly flexible?
- Protein Fibers
25) What are all 3 names for the cell
membrane?
- Plasma membrane, lipid bilayer, Fluid
mosaic model
Transport Graphic Organizer
- You have 10 minutes to work with your
clock buddy to complete the graphic
organizer
- Use your passive and active notes
- This will go in your folder as notes #4
Warm –Up #12
11/14/12
1) Label the picture below with phosphate, lipids,
hydrophilic, & hydrophobic
2) What makes a channel protein different from a
carrier protein?
3) List the three main differences between passive
and active transport.
4) Explain what is happening in
the picture. Use vocab words