Cell Transport Study Guide
Anatomy
Name:_______________________
Period:_______ Date:__________
1. Complete the following chart comparing the various methods of
cell transport.
Transport
Method
Active or
Passive
Uses ATP
(Y or N)
Transport
Direction
(down or
against)
Uses Carrier
Proteins
(Y or N)
Diffusion
Osmosis
Facilitated
Diffusion
Active
Transport
Endo/Exocytosis
2. Why do polar molecules and ions have problems crossing the cell
membrane by just diffusion? ___________________________
___________________________________________________
3. What assists the transport of these items across the membrane?
4. What material diffuses across the cell membrane during
osmosis? ____________________________
5. Match the description with the correct osmotic condition:
A. Isotonic
B. Hypertonic
C. Hypotonic
Solution with a lower solute concentration.
Solution with a lower water concentration.
Solution with a higher solute concentration.
Solution with a higher water concentration.
Two solutions with the same solute concentration.
Two solutions with the same water concentration.
6. A human blood cell (1%) solute is placed in salt water (5%)
solute.
a. Is the environment hypotonic, hypertonic or isotonic? (circle)
b. Is the cell hypotonic, hypertonic or isotonic? (circle)
c. What % is the water concentration inside the cell? _____
d. What % is the water concentration outside the cell? _____
e. Where is the water more concentrated? inside or outside
f. Which direction will the water move? into or out of the cell
g. What effect will this have on the cell? ________________
h. Is this an example of cytolysis or crenation? (circle)
7. A human blood cell (1%) solute is placed in distilled water (0%)
solute.
a. Is the environment hypotonic, hypertonic or isotonic? (circle)
b. Is the cell hypotonic, hypertonic or isotonic? (circle)
c. What % is the water concentration inside the cell? _____
d. What % is the water concentration outside the cell? _____
e. Where is the water more concentrated? inside or outside
f. Which direction will the water move? into or out of the cell
g. What effect will this have on the cell? ________________
h. Is this an example of cytolysis or crenation? (circle)
8. Sodium and potassium pumps maintain a high K+ and a low
Na+ concentration inside nerve cells. In order to maintain this
distribution of K+ and Na+ across the membrane, the
sodium/potassium pumps must actively pump ________ ions
out of the cell and _______ ions into the cell.
9. Identify the type of cell transport involved in each of the
following descriptions. Use the key provided to indicate your
answers.
A. active transport
B. diffusion
C. exocytosis
D. facilitated diffusion
E. osmosis
F. phagocytosis
G. pinocytosis
H. receptor-mediated endocytosis
Movement of water across a semipermeable membrane down its
concentration gradient.
The movement of materials cross a semipermeable membrane down their
concentration gradients with the assistance of carrier proteins.
The movement of materials down their concentration gradients.
Pumping of materials across a membrane against their concentration
gradients through protein channels.
Intake of small droplets of liquid by endocytosis.
Occurs when a vesicle fuses with the cell membrane releasing the contents
to the outside of the cell.
The molecule to be transported binds to a receptor protein; the receptorprotein complex migrates to specialized coated pits pinching off and
forming a vesicle.
Low-density lipoproteins outside the cell bind to LDL protein receptor; LDL
protein complex pinches off forming a vesicle inside the cell.
Na+/K+ pumps maintain excess K+ inside the cell and excess Na+ outside
the cell.
Glucose binds to receptor protein and is carried into the cell, down its
concentration gradient.
A white blood cell engulfs a harmful bacterium.
Drinking sea water causes the loss of water from cells lining the stomach
and intestines.