Download Plasma Membrane and Cell Transport Clicker Questions

1. The cell membrane (also known as the
plasma membrane) surrounding every cell
is composed primarily of ______.
A.DNA
B.Protein
C. Carbohydrates
D.Phospholipids
A phospholipid molecule: composed of a
phosphate group and two fatty acid tails.
2. The phospholipids in the cell membrane
are arranged in a bilayer (double layer).
How are the phospholipid molecules
arranged in this bilayer?
A.The nonpolar (hydrophobic) ends of
the molecules faces inwards
B.The polar (hydrophilic) ends of the
molecules faces inwards
C.The fatty acid tails of the molecules
faces inward
D.Both A and C
E.Both B and C
 The hydrophilic phosphate groups facing outwards
helps the cell interact with the watery environment
on both sides of the membrane.
 The hydrophobic fatty acid tails in the interior of the
membrane help create a barrier for many molecules
to allow control of movement.
3. Channels through the phospholipid
membrane are formed by
A.Proteins
B.DNA
C.Cellulose
D.Cholesterol
4. The term permeability means
A.The ability of a substance to
bend
B.The ability of a substance to
allow gases or liquids to pass
through
C.The ability of a substance to
dissolve
D.The ability of a substance to
exist for a long time with out
deteriorating.
Permeable surface
Impermeable surface
(not permeable)
5. In diffusion, molecules move
from _________________
concentration in a process that
__________________ additional
energy.
A.high to low; requires
B.high to low: does NOT
require
C.low to high; requires
D.low to high; does NOT
require
Additional energy is not required, because
diffusion occurs due to the random motion of
the molecules.
6. A hypotonic solution is one that
A. contains a higher concentration of
solutes (dissolved particles)
B. contains an equal concentration of
solutes
C. contains a lower concentration of
solutes.
D. is at a higher temperature
E. is at a lower temperature
Prefix reminders:
Hypo = below
Hypothermia is to have a body temperature
below normal.
Hyper= above
Hyperactive is to have high energy.
Iso= equal
An isoceles triangle has two equal sides.
7. If a cell with a 0.7 %sucrose
concentration inside is placed in a
solution that has a 0.5% sucrose
concentration, the process of osmosis
will occur. In this case,
A.sucrose will move into the cell
B.sucrose will move out of the cell
C.the cell will expand due to water
gain
D.the cell will shrink due to water
loss
E.both A and C
F.both B and D
0.7 %
sucrose
O.5% sucrose
Sucrose is too large to move through the
selectively membrane.
(Osmosis is occurring is a hint to this since it
means the movement of water.)
Remember that while the solutions are described
in terms of the solute concentration it is the
water that moves.
The solution that has a lower solute
concentration, has a higher water concentration.
Water will move from the hypotonic (low solute /
higher water) towards the hypertonic (higher
solute /lower water)
0.7 %sucrose
(99.3% water)
0.5% sucrose(99.5% water)
The shell-less egg in fresh water
(hypotonic) gained mass (water).
Water
Corn Syrup
Paramecium living in fresh water ponds has
to constantly pump out the water that
flows into the cell.
8. If a cell with a 0.9% salt
concentration inside is placed in a
1% salt solution, osmosis occurs.
Which of the following will happen
A.
the cell will shrink due to
water loss
B. salt will move out of the cell
C. the cell will expand due to
water gain
D. salt will move out of the cell
E. both A and D
F. both B and C
0.9 %
salt
1% salt
Salt is an ionic compound that can not move
through the nonpolar barrier of the
phospholipid membrane (without specialized
channels).
In osmosis, water will move in
the direction of the higher
SOLUTE (lower water)
concentration. Thus hypertonic
solutions, such as one high in
salt, causes cells to lose water.
• Drinking salt water will
dehydrate our cells
• Plants will wilt in a hypertonic
solution.
9. Which kind(s) of solution outside of
a cell could cause it to swell and
potentially lyse (burst open)?
A.
a hypertonic solution
B. a hypotonic solution
C. an isotonic solution
D. both A and C
E. both B and C
10. A saline (salt) solution is used for
fluid infusions into the blood stream.
This solution needs to be ____ with
blood cells.
A. hypotonic
B. hypertonic
C. isotonic
11. In an isotonic solution
A. the cell swells
B. the cell shrinks
C. there is NO movement of water
in or out of the cell
D. an equal amount of water
moves into the cell as moves
out
12. When a cell is placed in an
isotonic solution,
A. there is no NET movement of water
B. there is a dynamic equilibrium
C. there is a static equilibrium
D. both A and B
E. both A and C
Net change = Inputs- Outputs. No net change
when inputs and outs are balanced.
Dynamic equilibrium= an equilibrium (balance) is
when there is motion but the inputs equal the
outputs.
13. When a substance is secreted from a
cell in a process in which a vesicle fuses
with the plasma membrane to release the
substance to the outside, it is called
A. endocytosis
B. exocytosis
C. osmosis
D. halitosis
14. O2 is a small, nonpolar molecule. If it is
present outside the cell in high concentration
it can enter the cell by
A. Diffusion through the
membrane
B. Passive transport
C. Active transport
D. A and B
E. A and C
15. Glucose is a larger polar molecule. If
it is present outside of the cell in high
concentration, it can enter the cell by
A. Facilitated diffusion
B. Passive transport
C. Active transport
D. A and B
E. A and C
16. An amino acid (a large polar molecule) is
present outside the cell in low concentration. It
can be brought into the cell by
A. Facilitated diffusion through
specialized channels
B. Passive transport
C. Active transport
D. A and B
E. A and C
In facilitated diffusion, a channel allows the
substance to move through the membrane. But
no energy is provided, so it is a type of passive
transport and it can only move the substance
from high concentration to low concentration.
Active transport is required to move from low to
high concentration.
• High to low only
• Can move from low to
high
17. When a white blood cell engulfs a
bacterium, the process of _________
has occurred.
A.Endocytosis
B.Exocytosis
C.Osmosis
D.Dialysis
18. What will happen for the following setup in which two different liquids are
separated by a selectively-permeable
membrane. The dots represent solute
particles that can not move through the
membrane.
A.Water will move to
the right
B.Water will move to
the left
C.The system will
remain in
(lower concentration of water)
1. D
2. D
3. A
4. B
5. B
6. C
7. C
8. A
9. B
10.C
11.D
12.D
13.B
14.D
15.D
16.C
17.A
18.A