NYS Diffusion Through a Cell Membrane

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.

Tags

NGSS.MS-LS1-2

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-LS2-3

NGSS.MS-PS1-2

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

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-7

NGSS.MS-PS1-2

During osmosis

• water moves from high to low concentration
• large or oddly shaped molecules move across a cell membrane
• water moves when energy is used
• proteins are built

In the given scenario what will happen?  An egg is placed in pure water for 48 hours.

• The egg will gain water and swell.
• Water will move in and out of the cell equally, and the cell with neither shrink nor swell.
• The egg will lose water and shrink.

Tags

NGSS.MS-LS1-2

Passive transport requires no

• concentration gradients
• osmosis
• motion
• energy