WorksheetsRegents LE Labs Part D - #5 Diffusion through a Membrane
Total questions: 12
Worksheet time: 24mins
A step in a procedure used in the Diffusion Through a Membrane lab is represented in the diagram. Which procedure is represented in the diagram?
adding distilled water to the top of a cover glass on a slide
making an artificial cell
adding salt solution to a specimen under the cover glass
adding salt solution to a specimen under the cover glass (4) making a thin sample to prepare a slide of red onion cells
Molecules A and B are commonly found in plant cells. When tested, it was discovered that molecule A quickly passed through the artificial plant cell membrane. Molecule B did not pass through.
The locations of molecules A and B at the beginning of the experiment are shown. Which statement best describes what was observed when the setup was examined 20 minutes later?
Molecule A remained inside the artificial cell and molecule B remained outside.
Only molecule A was found both inside and outside the artificial cell.
Only molecule B was found both inside and outside the artificial cell.
Both molecules A and B were found inside and outside the artificial cell.
Which statement correctly explains the rise of liquid in the tube at the end of the experiment?
The concentration of sucrose molecules increased as water molecules entered the bag. This concentration increase pushed the liquid up the tube.
Water entered the bag due to the lower concentration of water inside. The extra water pushed the liquid up the tube as the bag filled.
Sucrose indicator entered the bag and reacted with the sucrose molecules. The reaction made the bag increase in size and pushed the liquid up the tube.
Sucrose molecules moved out of the bag and up the tube while water moved out, causing the rise of liquid in the tube.
Cell membranes are said to be selectively permeable. Which statement best explains what selectively
permeable means?
The cell membrane prevents any harmful substance from entering the cell.
The cell membrane lets certain substances enter the cell and keeps certain substances out of the cell.
The cell membrane has pores that let only water and glucose into the cell and carbon dioxide out.
The cell membrane allows only large molecules to diffuse into the cell.
A substance is most likely to diffuse into a cell when
the pH of the substance is greater than the pH of the cell
the concentration of the substance is greater outside the cell than inside
it is enclosed in an organelle such as a vacuole
it is a large organic food molecule such as protein or starch
This change is most likely caused by the cell being transferred from
distilled water to salt water
salt water to distilled water
salt water to tap water
distilled water to starch indicator
Which one of the following statements is best supported by the diagram?
Protein molecules are kept inside of the cell because the cell needs them.
Oxygen molecules entered the cell over time by active transport.
Water molecules are too large to enter or leave the cell, so they remained where they were at the start of the investigation.
The protein molecules are too large to diffuse out of the cell.
Which one of the following diagrams indicates the areas where each of these substances would be located
after 20 minutes?
After two hours, the color of the liquid in the beaker shown did not change. This shows that
glucose molecules combined to produce starch in the artificial cell
glucose moved from the artificial cell into the beaker
starch did not pass out of the artificial cell
starch was digested to glucose in the artificial cell
1
2
3
4
The experiment described was repeated, and an amber-colored solution was added to the water in the beaker. After 10 minutes, the water in the beaker remained amber-colored and the starch solution had turned blue-black. The most likely reason for this observation is that
water molecules moved into the thistle tube
water molecules moved out of the thistle tube
starch molecules moved out of the thistle tube
amber-colored solution moved into the thistle tube
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.
