NAME______________________
DATE_________
PERIOD_________
Transport and Plasma (Cell) Membrane Review
Word Bank:
Bilayer, Energy, Fatty Acids, Heads, Passive Transport, Plasma,
Proteins, Proteins, Sideways, Tails, With
Composition of the Cell Membrane & Functions
The cell membrane is also called the _______________ membrane and is
made of a phospholipid _____________. The phospholipids have a hydrophilic
(water attracting) __________ and two hydrophobic (water repelling)
____________. The head of a phospholipid is made of an alcohol and glycerol
group, while the tails are chains of ____________. Phospholipids can move
_______________ and allow water to pass through into or out of the cell. This
is known as simple ____________ because it does not require __________ and
the water or molecules are moving __________ the concentration gradient.
SKETCH AND LABEL a phospholipid coloring the heads red and the tails blue.
PHOSPHOLIPID
Another type of lipid in the cell membrane is cholesterol that makes the
membrane more fluid. Embedded in the phospholipid bilayer are __________
that also aid in diffusion and in cell recognition. Proteins called integral proteins
go all the way through the bilayer, while peripheral proteins are only on one side.
Large molecules like ___________ or carbohydrates use proteins to help move
across cell membranes. Some of the membrane proteins have carbohydrate parts
attached to help cells in recognize each other and certain molecules.
Correctly color code and identify the name for each part of the cell membrane.
Letter
A
B
F
G
Name/Color
Phospholipid bilayer
Integral protein (pink)
Fatty acid tails (orange)
Phosphate heads (yellow)
Letter
H
I
E
C
Name/Color
Peripheral protein (red)
Cholesterol (blue)
Glycoprotein (green)
Glycolipids (purple)
Osmosis and Tonicity
Define osmosis. _____________________________________
In which direction does water move across membranes, up or down the
concentration gradient? ________________
Define these 3 terms:
a. isotonic_____________________________________
b. hypertonic _____________________________________
c. hypotonic
_____________________________________
Use arrows to show the direction of water movement into or out of each
cell. Color and label the cell in an isotonic environment light blue, the hypotonic
environment yellow, and the hypertonic environment light green.
Match the description or picture with the osmotic condition:
A. Isotonic
_____ solution with a lower solute concentration
_____ solution in which the solute concentration is the same
B. Hypertonic
_____ condition plant cells require
_____ condition that animal cells require
C. Hypotonic
_____ red blood cell bursts (cytolysis)
_____ plant cell loses turgor pressure (Plasmolysis)
_____ solution with a higher solute concentration
_____ plant cell with good turgor pressure
_____ solution with a high water concentration
Label the tonicity for each solution (isotonic, hypotonic, or hypertonic):
____________
____________
____________
____________
Transport Requiring Energy
What type of transport is represented by the
following picture? _______________________
What energy is being used? ______________
In which direction (concentration gradient), is the
movement occurring? _________________
Color the internal environment of the cell yellow.
Color and Label the transport proteins red and the
substance being moved blue.
____________
_ ___________
Complete the table by checking the correct column for each statement:
Statement
Isotonic
Hypotonic
Hypertonic
solution
solution
solution
Causes a cell to swell
Doesn’t change the shape of a
cell
Causes osmosis
Causes a cell to shrink
Match the term with its correct description:
a. energy
b. facilitated diffusion
c. carrier protein
d. passive transport
e. active transport
f. channel protein
________ Transport protein that provides a tube-like opening in the plasma
membrane through which particles can diffuse
________ Is used during active transport but not passive transport
________ Particle movement from an area of higher concentration to an area of
lower concentration
________ A form of passive transport that uses transport proteins
________ Particle movement from an area of lower concentration to an area of
higher concentration
________ Transport protein that changes shape when a particle binds with it
Match the term with its correct description:
a. transport protein
d. passive transport
b. active transport
e. osmosis
c. diffusion
f. equilibrium
_____ The diffusion of water through a cell membrane
_____ The movement of substances through the cell membrane without the use
of cellular energy
_____ Used to help substances enter or exit the cell membrane
_____ When energy is required to move materials through a cell membrane
_____ When the molecules of one substance are spread evenly throughout
another substance to become balanced
_____ When molecules move from areas of high concentration to areas of low
concentration
Osmosis Practice Activity
Osmosis is the diffusion of water from an area of high concentration to an area of low concentration.
Only water moves in osmosis! The diagrams below show the concentration of water and salt inside
the cell and the concentration of water and salt surrounding the cell. Complete the sentences below
by comparing the concentration of the water inside the cell and the concentration outside the cell.
1.
5% NaCl
95% H2O
95% NaCl
5% H2O
a. Water will flow _____________________ (into
the cell, out of the cell, in both directions).
b. The cell will ______________________ (shrink,
burst, stay the same).
2.
5% NaCl
95% H2O
5% NaCl
95% H2O
a. Water will flow _____________________ (into the cell,
out of the cell, in both directions).
b. The cell will ______________________ (shrink, burst,
stay the same).
a. Water will flow _____________________ (into the
cell, out of the cell, in both directions).
3.
95% NaCl
5% H2O
5% NaCl
95% H2O
b. The cell will ______________________ (shrink,
burst, stay the same).
4. At which solution of concentration gradient is each cell diagram? (Hypotonic, Hypertonic, Isotonic)
a. _____________
b. ________________
c. ____________