WorksheetsNYS Diffusion Through a Membrane
Total questions: 39
Worksheet time: 25mins
Identify the cellular structure that diffusion occurs across.
ribosome
mitochondria
cytoplasm
cell membrane
chloroplast
Identify the cellular structure that is mostly water and is the jelly-like fluid in the cell.
ribosome
mitochondria
cytoplasm
cell membrane
chloroplast
Identify the substance/molecule that will not diffuse.
Starch
Glucose
Iodine
Identify the substance(s)/molecule(s) that will diffuse.
Starch
Glucose
Iodine
Identify the number that shows the cell membrane in this animal cell.
1
2
3
4
Identify which molecule is diffusing into the cell.
A
B
Molecule A cannot diffuse. What is a possible reason why?
Molecule A is a macromolecule and it is too large to move.
Molecule A is a building block and it is too large to move.
Molecule A is a building block and it is too small to move.
Molecule A is a macromole and it is too small to move.
Which of the following is a organic macromolecule?
starch
glucose
amino acid
nucleotide base
What is the starch indicator?
Iodine
Bromothymol Blue
Benedict's Solution
Glucose
What color does the starch indicator turn when it comes in contact with starch?
blue-black
blue
orange-red
yellow
What is DIFFUSION?
none
Cell membranes are Selectively Permeable. This means that
Some molecules can get in while others cannot
All molecules may enter and leave freely
Only large molecules enter unless energy is used
The membrane will automatically keep concentrations the same inside and out
Which molecule does not pass through a membrane?
starch
glucose
iodine
In our diffusion lab, what happened to the “cell” that contained starch solution after 20 minutes?
The contents of the dialysis tube turned blue-black.
The liquid in the beaker would turn blue-black.
The dialysis tube would burst.
There would be no change.
After 24 hours, where will starch be found in this experiment?
outside the cell, only
outside and inside the cell
inside the cell, only
After 24 hours, where will glucose be found in this experiment?
inside the cell, only
outside the cell, only
both inside and outside the cell.
A student fi lled two Petri dishes with a clear gel made with corn starch. He was given two unknown solutions (A and B) and was asked to determine which solution contained a chemical that digests starch. Using a clean cotton swab, he dipped it into solution A and wrote a “?” invisibly onto the gel in one of the Petri dishes. He repeated the same procedure on the second Petri dish with a clean cotton swab he dipped in solution B. Twenty minutes later, he added starch-indicator solution to the surface of both Petri dishes. The surface of the Petri dish with solution A added turned completely blue. Most of the surface of the Petri dish to which solution B was added was blue, except the “?” was clear. The results are illustrated in the attached picture.
An observation that supports the student’s conclusion that solution B contained a chemical that digests starch is that the
damp cotton swab absorbed some of the starch where it touched the gel
starch indicator changed the color of the gel to blue
area swabbed with solution B remained clear
chemical in the starch indicator reacted with the chemical in B
A student placed artificial cells, each containing a 25% sugar solution, into three different beakers containing sugar solution which varied in concentration from 0% to 25%. The setups are shown in the picture.
The student collected data on the mass of each artificial cell. The student predicted that the cell in the beaker with 25% sugar solution would have the greatest change in mass after 24 hours. Would his prediction be correct? Support your answer.
yes because it has the highest sugar concentration for both inside and outside the cell.
no because the concentration of sugar is the same inside and outside the cell, so the mass will stay the same.
Yes because more sugar will move into the cell since it is small enough.
No because the cell will shrink in the sugar solution.
The diagram represents a sugar cube being dropped into an undisturbed beaker of water at room temperature. One sugar molecule is labeled.
The diagram represents one of many microscopic air sacs in a human lung. The alveolus (air sac) is the place where oxygen (O2) and carbon dioxide (CO2) move into or out of the blood, as represented in the diagram. Alveolus CO2 O2 Out In Capillary Which statement best explains why these gases are able to move in the directions shown in the diagram?
The CO2 moves out of the capillary and into the alveolus to make more room for the blood to carry O2.
The O2 is needed by the cells, so it is actively transported into the blood. The CO2, which is not needed, is actively transported out of the blood.
The blood coming to the lungs is low in CO2 and high in O2, so the gases each diffuse from a lower to a higher concentration in this area
The blood coming to the lungs is high in CO2 and low in O2, so the gases each diffuse from a higher to a lower concentration in this area.
Before placing the potato in the beaker, the student used an electronic balance to determine the mass of the potato cube. The mass of the cube was determined again after it was in the beaker for an hour. Describe how this information could specifically be used to determine if water moved during the investigation.
If there was a decrease in mass, the water moved into the cell.
If there was a decrease in mass, the starch moved out of the cell.
If there was a decrease in mass, the starch indicator moved into the cell.
If there was an increase in mass, water moved into the cell.
A cube cut from a potato is placed in a beaker of distilled water. The potato cells have a relatively high concentration of starch and a relatively low concentration of water. The diagram represents the water and starch molecules in and around one of the potato cells in contact with the water in the beaker. Which row in the chart correctly describes what would be expected to occur in the potato cells, with regard to both the starch and water molecules?
What happened to the CELL WALL and the CELL MEMBRANE in these plant cells?
Both the CELL WALL and CELL MEMBRANE shrunk
Only the CELL WALL shrunk, the CELL MEMBRANE stayed the same
The CELL WALL stayed the same, only the CELL MEMBRANE shrunk
Both the CELL WALL and CELL MEMBRANE stayed the same
Under the microscope, you are viewing
one onion
one onion cell
a collection of onion cells
What was most likely added to this slide?
Distilled Water
Salt Water
nothing
The water left the onion cell when salt was added because
the water diffused into the higher concentration of water
the water diffused into the lower concentration of salt
the salt diffused into the cells pushing the water out
the salt created a lower concentration of water around the cells, so the water diffused out of the cells .
Why does distilled water have the opposite effect of salt water?
Distilled water is a low concentration of water and salt is a higher concentration- Things diffuse from L to H
Distilled water is a higher concentration of water and salt water tend to have a lower concentration- things diffuse from H to L
Distilled water is a higher concentration of water and salt water tend to have a lower concentration- things diffuse from L to H
When a cell shrinks in size, what type of solution was added to it?
Salt solution
Tap water
distilled water
iodine solution
Red onion cells undergo the change represented in the diagram below. This change is most likely caused by the cell being transferred from
distilled water to starch indicator
distilled water to salt water
salt water to tap water
salt water to distilled water
The diagram below represents what occurred when an onion cell and a red blood cell were placed in distilled water. The best explanation for why the onion cells do not burst, while red blood cells often do, is that
the red blood cells have only a cell membrane, which does not protect them from bursting
the onion cells do not have a cell wall that could protect them from bursting
the onion cells have a cell membrane, which can protect them from bursting
the red blood cells have a cell wall, which does not protect them from bursting
A model cell is 95% water and 5% salt. It is placed into a beaker with a solution. After 20 minute the mass of the model cell has increased from 40 to 45 grams. What solution could the cell have been put in?
95% water and 5% salt
99% water and 1% salt
90% water and 10% salt
True or false: When a red onion cell is placed in a salt solution, the salt diffuses.
TRUE, salt diffuses through the membrane.
FALSE, water diffuses out of the cell, salt does not diffuse in the lab.
Which laboratory technique is shown in the diagram?
testing a specimen for amino acids
determining the pH of a specimen
measuring the photosynthetic rate in a specimen
preparing a wet mount slide of a specimen
