Biology Student
EQ: How do cells eat and drink?
Cell Transport
Review
Targets
1) Evaluate the significance of homeostasis in maintaining
a healthy environment for the cell and well-being of
the organism
3) Examine the major functions of the cell membrane as it
relates to transport including the lipid bilayer and
protein components
8) Assess the circumstances under which energy would
or would not be used by the cell for transport
10) Relate water as the major component of cytoplasm
with its significance in maintaining homeostasis
11) Recognize macromolecules as the building blocks of
living things, emphasizing lipids and proteins as the
structural components of the cell membrane
Enduring Understanding
Cellular processes maintain homeostasis.
Broad Brush Knowledge
homeostasis, equilibrium, cell structure and function
Concepts Important to Know and Understand
Cell Transport, Constancy and Change
Core Objectives
4. Investigate the importance of cell transport in maintaining homeostasis.
____________ is the maintenance of an internal environment that is in __________________ (stable)
despite __________ in external conditions. Cells maintain homeostasis by passive and active transport
across their _______________________.
MATCHING:
1.
2.
3.
channel proteins move substances from higher to lower
concentrations
transport not involving use of energy
pressure in plant cell due to osmosis
4.
5.
6.
used by unicellular, fresh water organism to pump out excess water
transport by carrier molecules involving use of energy
proteins in cell membrane that move substances into or out of cell
A.
channel protein
B. passive transport
C. osmotic (water)
pressure
D. active transport
E. contractile vacuole
F. facilitated diffusion
Study the diagrams of the beakers below, noting the concentrations of various substances in the
beakers and in the cellulose bags. Mark the relative concentrations of the water (w) and dissolved
substances (ds) in the beaker and in the bag with G for greater or L for less. Water molecules can
pass through the cellulose, but starch cannot. Draw arrows in the diagrams to show the direction
in which water will move. Then answer the following questions.
1. Which of the two beakers contains a solution that has less
beaker 1
beaker 2
water relative to the bag's contents? ___________________
90% water
2. What will eventually happen to the concentrations of the
10% starch
solutions inside and outside the bag in beaker 2? _________
________________________________________________
3. Will the same thing happen in beaker I? _____ Why or why
not? _____________________________________________
__w __w
4. The bag in which beaker will experience a rise in osmotic
__w __w
__ds __ds
__ds __ds
pressure? ________ What will eventually happen as the
pressure rises? ____________________________________
5. Cells behave much like the cellulose bag. When such
100% water
80% water
movements occur across the cell membrane are they
20% starch
considered to be passive or active transport? ____________
Why? ____________________________________________
Cell Transport – Biology - STUDENT (Revised June 24, 2008)
(printed 3/3/2016) p. 1
Label each diagram with arrows to
show direction of water movement.
Identify each beaker as to if the cell
will shrink, swell, or stay the same.
A
BEAKER
70% water
__% ds
CELLS
80% water
__% ds
_______________
B
BEAKER
80% water
__% ds
CELLS
80% water
__% ds
C
________________
BEAKER
90% water
__% ds
CELLS
80% water
__% ds
________________
1-3. Draw an arrow to show which way the substance indicated will move.
1. Which way will the glucose
2. Which way will the water
3. Which way will the carbon
move?
move?
dioxide move?
0.5%
glucose in
the blood
outside of
the cell
0.3% glucose
in the muscle
100% H2O
outside of
the cell
20 units of
CO2 in lung air
sacs
sacs
60 units of
CO2 in blood
Animal Cell Before
Animal Cell After
4. Which way did water move in this example, into or
out of the cell? _______________
What may happen to an animal cell in this example?
__________________________________________
Animal Cell Before
Animal Cell After
5. Which way did water move in this example, into or
out of the cell? _______________
What may happen to an animal cell in this example?
__________________________________________
Plant Cell Before
Plant Cell After
6. Which way did water move in this example, into or
out of the cell? _______________
What may happen to a plant if this happens in all of
its cells? __________________________________
Plant Cell Before
Plant Cell After
7. Which way did water move in this example, into or
out of the cell? _______________
What may happen to a plant if this happens in all of
its cells? __________________________________
Would a plant cell burst? ______________________
8. What is happening? - getting bigger / getting smaller / staying the same
Why? - greater water outside the cell so water moving into the cell / greater water inside the cell so water
moving out of the cell / water is equal inside & outside the cell so water moves equally in and out of the cell
NORMAL rbc
rbc in SALT water
rbc in PURE water
What in happening
What in happening
What in happening
to this cell? _____
to this cell? _____
to this cell? _____
Why? __________
Why? __________
Why? __________
_______________
_______________
_______________
_______________
_______________
_______________
Cell Transport – Biology - STUDENT (Revised June 24, 2008)
(printed 3/3/2016) p. 2
9. Draw an arrow to show which way the water (solvent) would move.
Inside of cell:
30% solute
70% solvent
Outside of cell:
10% solute
90% solvent
Inside of cell:
10% solute
90% solvent
Outside of cell:
20% solute
80% solvent
Inside of cell:
12% solute
Outside of cell:
40% solute
Inside of cell:
80% solvent
Outside of cell:
70% solvent
Does diffusion or osmosis ever stop? ______ Why/whynot? _____________________________________
What organelle in plant cells stores water to maintain osmotic pressure in the cell?
Cell Transport – Biology - STUDENT (Revised June 24, 2008)
(printed 3/3/2016) p. 3