Regents Living Environment Diffusion Lab

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

Tags

NGSS.MS-PS1-2

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 is found both inside and outside the artificial cell.

• Only molecule B is found both inside and outside the artificial cell.

• Both molecules A and B are found inside and outside the artificial cell.

Tags

NGSS.MS-LS1-2

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.

Tags

NGSS.MS-LS1-2

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

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-5

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.

Tags

NGSS.MS-LS1-2

Which one of the following diagrams indicates the areas where each of these substances would be located

after 20 minutes?

• 
• 
• 
• 

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-7

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

Tags

NGSS.MS-LS1-2