Cell Membrane Structure and
Function
Hot Seat
Rules
A. You are competing against classmates in your row (across the
classroom). The hot seat is the seat in each row closest to
the outside windows.
B. Your answer must be written and you must stop writing when
the teacher says, “pencils down”
C. After hearing the correct answer you will check your answer
with the person to your left and the person to your right.
D. If your answer is correct and the person to your right
answered incorrectly you move into their seat (towards the hot
seat) and they will move into yours.
E. If your answer is incorrect and the person to your left
answered correctly, you move into their seat (away from the
hot seat) and they will move into yours.
F. Remember you may only move one seat at a time! If you get
it right and two people in front of your get it wrong you still can
only move one seat!
Which cell structure helps the cell
maintain homeostasis by
controlling what enters and leaves
the cell?
A. Cell Membrane
Predict the concentration of solute molecules on
each side of the membrane after 24 hours.
Label “A” and “B” below
A. Phospholipids
B. Transport Protein or Protein Channel
A
B
When a membrane is said to be selectively
permeable, this means that _______.
A. half of the membrane is permeable and the other
half is not
B. the membrane is permeable part of the time
C. the cell regulates what passes in and out
D. only large molecules can pass through
Which of the following supports the
picture shown below?
A. The concentration of solute in the cell was higher
than in the solution so water entered the cell.
B. The concentration of solute in the cell was lower
than in the solution so water left the cell.
C. The concentration of solute in the cell was higher
than in the solution so water left the cell.
D. The concentration of solute in the cell was lower
than in the solute was water entered the cell.
Which of the following supports the
picture shown below?
A. The concentration of solute in the cell was higher
than in the solution so water entered the cell.
B. The concentration of solute in the cell was lower
than in the solution so water left the cell.
C. The concentration of solute in the cell was higher
than in the solution so water left the cell.
D. The concentration of solute in the cell was lower
than in the solute was water entered the cell.
Which of the following
correctly explains the
picture?
A. The concentration of solute in the cell was
higher than in the solution so water entered
the cell.
B. The concentration of solute in the cell was
lower than in the solution so water left the
cell.
C. The concentration of solute in the cell was
equal to the concentration in the solution so
water is moved into the cell
D. The concentration of solute in the cell was
equal to the concentration in the solute so
the cell is at equilibrium.
Which of the following correctly
explains the picture?
A. The concentration of solute in the cell was
higher than in the solution so water entered
the cell.
B. The concentration of solute in the cell was
lower than in the solution so water left the
cell.
C. The concentration of solute in the cell was
higher than in the solution so water left the
cell.
D. The concentration of solute in the cell was
lower than in the solution so water entered
the cell.
Which of the following correctly
explains the picture?
A. The concentration of solute in the cell
was higher than in the solution so
water entered the cell.
B. The concentration of solute in the cell
was lower than in the solution so water
left the cell.
C. The concentration of solute in the cell
was higher than in the solution so
water left the cell.
D. The concentration of solute in the cell
was lower than in the solution so water
entered the cell.
Choose the best definition of
diffusion:
A. The movement of molecules from an area of high
concentration to an area of low concentration.
B. The movement of molecules from an area of low
concentration to an area of high concentration.
C. The movement of water molecules from an area of high
concentration to an area of low concentration.
D. The movement of water molecules from an area of low
concentration to an area of high concentration.
What is the difference between active transport
(AT) and facilitated diffusion (FD)?
A. AT requires protein carriers; FD does
not.
B. AT requires energy; FD does not.
C. AT requires a concentration gradient;
FD does not.
D.AT requires a cell membrane; FD
does not.
Which method is used by O2 and CO2
to cross the cell membrane?
A. Active Transport
B. Facilitated Diffusion
C. Diffusion
D. Osmosis
Which of the following substances requires a
transport protein in order to cross a membrane?
A. O2
B. CO2
C. Glucose
D. Na+
E. Both C and D
Most scientists do not classify viruses as
living things because
A. Viruses do not contain DNA
B. Viruses do not contain protein
C. Viruses are not made of organic compounds.
D. Viruses need a host cell to reproduce.
Will the cell shrivel, swell, or stay the
same?
8% sugar
1% sugar
Predict the concentration of solute on
each side of the membrane after 24
hours
A. Equal concentration on both sides
The movement of water from an area of high water
concentration to an area of low water concentration is
called
A. active transport
B. Diffusion
C. Osmosis
D. facilitated diffusion
A cell surrounded by a more
concentrated solution
A. loses water and shrinks
B. gains water and expands
C. gains and loses the same amount of water, staying the same shape
D. none of the above
A cell surrounded by a less
concentrated solution
A. loses water and shrinks
B. gains water and expands
C. gains and loses the same amount of water, staying the same shape
D. none of the above
A cell surrounded by a solution of the
same concentration
A. loses water and shrinks
B. gains water and expands
C. gains and loses the same amount of water, staying the same shape
D. none of the above
Celery sticks left in a dish of freshwater for several hours
become stiff and hard. Similar celery sticks left in a saltwater
solution become limp and soft. From this we can deduce that
freshwater is ________ and the saltwater is ___________ to
the cells of the celery sticks.
A. less concentrated, more concentrated
B. more concentrated, less concentrated
C. less concentrated, less concentrated
D. more concentrated, more concentrated
The smell of ammonia spreading throughout a
room would be an example of_______.
A. Diffusion
B. Facilitated Diffusion
C. Osmosis
D. Active Transport
Which section of the cell membrane is
hydrophobic?
A. The tails of the phospholipids
Hydrophilic
(polar)
Hydrophobic
(non-polar)
Which section(s) of the cell membrane
are hydrophilic?
A. The heads of the phospholipids
Hydrophilic
(polar)
Hydrophobic
(non-polar)
What is the difference between a
solute and a solvent?
A. A solute is the thing being dissolved and a solvent is the
liquid doing the dissolving.
B. Remember water is the universal solvent!
Which of the following would be an
example of osmosis?
A. The smell of ammonia spreading through the room.
B. The shriveling of a snail after salt is poured on it
C. Water being poured into a glass
D. The absorption of water by a bathroom sponge.
A state of biological balance maintained
by living organisms is called..
A. Exocytosis
B. Osmosis
C. Homeostasis
D. cytolysis
Does the picture demonstrate passive
or active transport?
Movement of substances across the membrane
without the use of cellular energy is termed
A. Active transport
B. Carrier transport
C. Passive transport
D. Protein transport
What must a virus do to reproduce?
A. Invade a host cell.
If the cell below has a glucose concentration of 20 ppm, which
of the following concentrations of the solution would cause the
cell to swell?
A. 10 ppm
B. 20 ppm
C. 30 ppm
D. 40 ppm
Will the cell shrivel, swell, or stay the
same?
84% sugar
96% sugar
Will the cell shrivel, swell, or stay the
same?
87% sugar
87% sugar
Dialysis is the process by which an artificial kidney
machine removes waste products from a
patients’ blood. The dialysis membrane has
openings that allow salts and other wastes
dissolved in the blood to pass through without
expending any energy. This is an example of
(passive / active) transport.
A. Passive Transport
Inside bag A is a 50% glucose solution
and inside bag B is a 30% glucose
solution. Both bags are put into beakers
containing 100% water.
A. Bag A will swell.
B. Bag B will swell.
C. Both bags will swell.
50%
D. Both bags will shrivel
E. Both bags will remain the same.
100%
30%
What relationship between surface area and volume must
organisms achieve to ensure efficient delivery of nutrients
A. keep surface area and volume equal
B. maximize surface area and minimize volume
C. minimize surface area and maximize volume
D. none of these
Is the concentration of the solute in the
solution greater than, less than, or
equal to the concentration of the solute
in the cytoplasm of the cell?
A. The concentration of solute in
the solution is greater than the
concentration of solute in the
cytoplasm of the cell.
Cells must have ways to maintain
homeostasis. Which is an example of ways
cells can do this?
A.
A) Plant cells have a cell wall to keep from bursting
B.
B) Fresh water single-celled animals constantly pump
water out
C.
C) Eggs have shells to keep them from dehydrating
D.
D) All of the above are examples
If a plant cell contains more solutes than its
surrounding environment
A. The cell will burst
B. Water will enter the cell
C. Water will leave the cell
D. There will be no net movement of water
The concentration of calcium in a cell is 0.3%. The
concentration of calcium in the fluids surrounding the
cell is 0.1%. How could the cell obtain more calcium?
A. Facilitated diffusion
B. Active transport
C. Osmosis
D. diffusion
Which cell has the largest surface area
to volume ratio?
Identify one difference and one similarity
between facilitated diffusion and active transport?
Facilitated Diffusion
Active Transport
A. Use proteins
A. Use proteins
B. No Energy
B. Energy
C. High Conc. To Low
C. Low Conc. To High
Conc.
D. Both transport bigger
molecules that can’t cross
through the
phospholipids.
Conc.
D. Both transport bigger
molecules that can’t cross
through the
phospholipids.
Which of the following is NOT a type of
passive transport?
A. Diffusion
B.
Osmosis
C. Protein pumps
D. Facilitated diffusion
What will happen to an animal cell placed
in a salt water solution?
A. The cell will shrink
B. The cell will expand
C. The cell will burst
D. The cell will shrink and then
expand and then shrink again
An animal cell placed in a solution of lower
solute concentration will:
A. Die
B. take on water
C. lose water
D. Divide
Which of the following is a type of active
transport?
A. sodium potassium pump
B. osmosis
C. diffusion
D. Facilitated diffusion
Active transport requires
A. a concentration gradient
B. osmosis
C. energy
D. a hypertonic solution