di usion practice with part 1 of lab
Name:
1.
Date:
Molecules A and B come in contact with the cell
membrane of the same cell. Molecule A passes
through the membrane readily, but molecule B
does not. Which statement could describe
molecules A and B?
A.
Molecule A is a protein, and molecule B is a
fat.
B.
Molecule A is a starch, and molecule B is a
simple sugar.
C.
Molecule A is an amino acid, and molecule B
is a simple sugar.
3.
The accompanying diagram represents a cell in
water. Formulas of molecules that can move
freely across the cell membrane are shown. Some
molecules are located inside the cell and others
are in the water outside the cell.
D. Molecule A is a simple sugar, and molecule B
is a starch.
Based on the distribution of these molecules, what
would most likely happen after a period of time?
2.
carbon dioxide
B.
C.
ATP
D. glucose
The concentration of O2 will increase inside
the cell.
B.
The concentration of CO2 will remain the
same inside the cell.
C.
The concentration of O2 will remain the same
outside the cell.
D. The concentration of CO2 will decrease
outside the cell.
The process of active transport requires the most
direct use of
A.
A.
amino acids
4.
page 1
The energy an organism requires to transport
materials and eliminate wastes is obtained directly
from
A.
DNA
B.
starch
C.
hormones
D. ATP
5.
The accompanying diagram represents movement
of a large molecule across a membrane.
7.
In the accompanying diagram, the dark dots
indicate small molecules. These molecules are
moving out of the cells, as indicated by the
arrows. The number of dots inside and outside of
the two cells represents the relative concentrations
of the molecules inside and outside of the cells.
Which process is best represented in this diagram?
A.
active transport
B.
di usion
C.
protein building
D. gene manipulation
ATP is being used to move the molecules out of
the cell by
A.
cell A, only
B.
cell B, only
C.
both cell A and cell B
D. neither cell A nor cell B
6.
Base your answer(s) to the following question(s)
on the diagram of sugar in a beaker of water and
on your knowledge of biology.
What process accounts for the change shown in
lab setup A?
page 2
di usion practice with part 1 of lab
8.
Base your answer(s) to the following question(s)
on the diagram, which represents a unicellular
organism in a watery environment. The 's
represent molecules of a speci c substance.
9.
An investigation was set up to study the movement
of water through a membrane. The results are
shown in the diagram below.
Based on these results, which statement correctly
predicts what will happen to red blood cells when
they are placed in a beaker containing a water
solution in which the salt concentration is much
higher than the salt concentration in the red blood
cells?
Arrow A represents active transport. State two
ways that active transport is di erent from
di usion.
A.
The red blood cells will absorb water and
increase in size.
B.
The red blood cells will lose water and
decrease in size.
C.
The red blood cells will rst absorb water,
then lose water and maintain their normal
size.
D. The red blood cells will rst lose water, then
absorb water, and nally double in size.
10.
page 3
Molecules A and B are both organic molecules
found in many cells. When tested, it is found that
molecule A cannot pass through a cell membrane,
but molecule B easily passes through. State one
way the two molecules could di er, that would
account for the di erence in the ability to pass
through the cell membrane.
di usion practice with part 1 of lab
11.
Base your answer(s) to the following question(s)
on the information below and on your knowledge
of biology.
12.
In a class, each student made three
models of the small intestine using three
arti cial membrane tubes. They lled each
of the three tubes with equal amounts of
water, starch, protein, and vitamin C. They
added starch-digesting enzyme to tube 1.
They added protein-digesting enzyme to
tube 2. No enzyme was added to tube 3.
The ends of the membrane tubes were sealed
and the tubes were soaked for 24 hours in
beakers of pure water. The beakers were
numbered 1, 2, and 3, corresponding to the
number of the tube they contained. At the
end of the experiment, the students removed
the tubes and tested the water in the beakers
for the presence of nutrients.
The diagram below represents a container of water
and two di erent kinds of molecules, A and B,
separated into two chambers by a membrane
through which only water and molecule A can
pass.
On the diagram of the container below, indicate
the distribution of molecules A and B after the net
movement of these molecules stops.
Which statement would be a valid inference if
vitamin C had been present in the water in each
beaker?
A.
The water synthesized vitamin C.
B.
Vitamin C is a small molecule.
C.
The membrane tube produced vitamin C.
D. The concentration of vitamin C is higher in
the beaker than in the membrane tube.
13.
Which row in the chart below best describes the
active transport of molecule X through a cell
membrane?
Row
page 4
Movement of Molecule X
ATP
(1)
high concentration ! br low concentration
(2)
high concentration ! br low concentration
(3)
low concentration ! br higher concentration
used
(4)
low concentration ! br higher concentration
not used
A.
Row (1)
B.
C.
Row (3)
D. Row (4)
used
not used
Row (2)
di usion practice with part 1 of lab
14.
Base your answer(s) to the following question(s)
on the information and diagram below and on your
knowledge of biology. The diagram illustrates an
investigation carried out in a laboratory activity on
di usion. The beaker and the arti cial cell also
contain water.
15.
The diagram below shows the relative concentration
of molecules inside and outside of a cell.
Which statement best describes the general
direction of di usion across the membrane of this
cell?
Predict what would happen over time by showing
the location of molecules I, G, and S in diagram B
below.
A.
Glucose would di use into the cell.
B.
Protein would di use out of the cell.
C.
Carbon dioxide would di use out of the cell.
D. Oxygen would di use into the cell.
page 5
di usion practice with part 1 of lab
16.
Base your answer(s) to the following question(s)
on the diagram below and on your knowledge of
biology. The diagram shows the changes that
occurred in a beaker after 30 minutes. The beaker
contained water, food coloring, and a bag made
from dialysis tubing membrane.
17.
Which statement best explains the changes shown?
A.
Molecular movement was aided by the
presence of speci c carbohydrate molecules
on the surface of the membrane.
B.
Molecular movement was aided by the
presence of speci c enzyme molecules on the
surface of the membrane.
C.
Molecules moved across the membrane
without additional energy being supplied.
D. Molecules moved across the membrane only
when additional energy was supplied.
When the colors yellow and blue are combined,
they produce a green color. Which statement most
likely describes the relative sizes of the yellow and
blue food-coloring molecules in the diagram?
A.
The yellow food-coloring molecules are small,
while the blue food-coloring molecules are
large.
B.
The yellow food-coloring molecules are large,
while the blue food-coloring molecules are
small.
C.
18.
Both the yellow food-coloring molecules and
the blue food-coloring molecules are large.
D. Both the yellow food-coloring molecules and
the blue food-coloring molecules are small.
A student lls a dialysis membrane bag with a
mixture of red dye, yellow dye, and water. He
soaks the bag in pure water for 24 hours and
then observes that the water outside the bag turns
yellow. Which statement best explains the results
of this experiment?
A.
Water di used into the membrane bag.
B.
The dialysis membrane actively transported
yellow dye molecules.
C.
Only red dye di used through the membrane.
D. The yellow dye molecules are smaller than
the red dye molecules.
page 6
di usion practice with part 1 of lab
19.
Base your answers to the following questions on the information and table below and on your knowledge of biology.
A model of a cell is prepared and placed in a beaker of uid as shown in the diagram below. The
letters A, B, and C represent substances in the initial experimental setup.
The table below summarizes the content and appearance of the cell model and beaker after 20 minutes.
Results after 20 minutes
Substances
Color
Outside of
cell model
water, A, C
amber
Inside of
cell model
water, A, B, C
blue black
Complete the table below to summarize a change in location of substance C in the experimental setup.
Name of
Substance C
Direction of Movement
of Substance C
page 7
Reason for the Movement
of Substance C
di usion practice with part 1 of lab
20.
Identify substance B and explain why it did not
move out of the model cell.
21.
Base your answers to the following questions on
the experimental setup shown below.
On the diagram below, draw in the expected
locations of the molecules after a period of one
hour.
page 8
di usion practice with part 1 of lab
22.
The diagram below represents the distribution of some molecules inside and outside
Which factor prevented the protein molecules (
) from moving out of the cell?
A.
temperature
B.
C.
molecule size
D. molecule concentration
page 9
pH
di usion practice with part 1 of lab
23.
Base your answers to the following questions on
the information and diagram below and on your
knowledge of biology.
25.
The diagram below shows molecules represented
by X both outside and inside of a cell.
Starch turns blue black in the
presence of a starch indicator. Dialysis
tubing tied at both ends and containing
starch solution is placed in a beaker of
water. Yellowish brown starch indicator
is then added to the
A process that would result in the movement of
these molecules out of the cell requires the use of
What will the solutions in the beaker and the
tubing look like after 20 minutes?
A.
The indicator solution in the beaker will be
blue black and the starch solution in the
tubing will not change color.
B.
The starch solution in the tubing will be blue
black and the indicator solution in the beaker
will not change color.
C.
Neither the indicator solution nor the starch
solution will be blue black.
D. Both the indicator solution and the starch
solution will be blue black.
24.
26.
This laboratory setup would most likely be used to
demonstrate the process of
A.
di usion
B.
C.
replication
D. cellular respiration
A.
DNA
B.
ATP
C.
antigens
D. antibodies
A laboratory setup using an arti cial cell made
from dialysis tubing is shown in the diagram
below.
Identify the process that would most likely be
responsible for the movement of glucose from
inside the arti cial cell to the solution outside of
the cell.
active transport
page 10
di usion practice with part 1 of lab
27.
Base your answers to the following questions on
the laboratory setup illustrated below and on your
knowledge of biology.
28.
A.
glucose moved from the arti cial cell into the
beaker
B.
starch did not pass out of the arti cial cell
C.
starch was digested to glucose in the arti cial
cell
D. glucose molecules combined to produce starch
in the arti cial cell
Identify the color of the contents of the arti cial
cell after two hours.
29.
After two hours, the color of the liquid in the
beaker did not change. This shows that
A model cell setup is represented in the “Initial State” diagram below.
Which diagram indicates the areas where each of these substances would be located after 20 minutes?
A.
B.
C.
page 11
D.
di usion practice with part 1 of lab
30.
Two molecules, A and B, and their distribution
inside and outside of a cell are represented in the
diagram below.
State one possible reason why molecule A could
di use across the membrane of the cell but
molecule B could not.
page 12
di usion practice with part 1 of lab
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di usion practice with part 1 of lab
1.
Answer:
Points:
D
1
2.
Answer:
Points:
C
1
3.
Answer:
Points:
A
1
4.
Answer:
Points:
D
1
5.
Answer:
Points:
A
1
6.
Answer:
Points:
di usion, passive transport, or dissolving
1
7.
Answer:
Points:
A
1
8.
Answer:
Active transport requires the use of
energy by the organism.
12/6/2021
12.
Answer:
Points:
1
13.
Answer:
Points:
C
1
14.
Answer:
Points:
1
15.
Answer:
Points:
C
1
16.
Answer:
Points:
D
1
Points:
In active transport, molecules move from
a region of lower concentration to a
region of higher concentration of those
molecules.
1
9.
Answer:
Points:
B
1
17.
Answer:
Points:
C
1
Molecule A is larger than molecule B. OR
Molecule A is too large to pass through
membrane pores. OR One molecule is
larger than the other. OR shape OR
charge OR solubility
1
18.
Answer:
Points:
D
1
10.
Answer:
Points:
11.
Answer:
Points:
B
1
19.
Answer:
Name of
Substance C
starch indicator
iodine
Points:
1
20.
Answer:
Points:
starch
1
Direction of Movement
of Substance C
into model cell
from high to
low concentration
Reason for the Movement
of Substance C
small size of molecules
di erences in concentration
di usion
Teacher's Key
21.
Answer:
Points:
1
22.
Answer:
Points:
C
1
23.
Answer:
Points:
B
1
24.
Answer:
Points:
A
1
25.
Answer:
Points:
B
1
26.
Answer:
Points:
Example answer: di usion, passive
transport
1
27.
Answer:
Points:
Blue Black
1
28.
Answer:
Points:
B
1
29.
Answer:
Points:
C
1
30.
Answer:
Points:
Molecule A is smaller than molecule B.
1
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