SC 6 L 14 3

A substance is most likely to diffuse into a cell when

• it is a large organic food molecule such as protein or starch

• it is enclosed in an organelle such as a vacuole

• the concentration of the substance is greater outside the cell than inside

• the pH of the substance is greater than the pH of the cell

A person with swollen gums rinses his mouth with warm salt water, and the swelling decreases. Which of the following has occurred?

• The swollen gums have absorbed the saltwater solution.

• The saltwater solution lowers the temperature of the water in the gums.

• The salt in the solution has moved against the concentration gradient.

• The water in the gums has moved out due to the high concentration of salt in the solution.

Tags

NGSS.MS-PS1-2

Osmosis occurs when there is a different concentration of solute molecules on each side of the membrane. The drawing below shows a beaker containing a 30% salt solution and a suspended cell containing a 10% salt solution. What statement best describes the cell after 20 minutes?

• Water will move from the cell into the beaker, resulting in a smaller cell.

• Water will move from the beaker into the cell, resulting in a larger cell.

• Salt will move from the cell into the beaker, resulting in a smaller cell.

• Salt will move from the beaker into the cell, resulting in a larger cell.

Tags

NGSS.MS-LS1-3

The diagram represents a plant cell in tap water as seen with a compound light microscope.  What will happen to the appearance of the cell after it has been placed in a 15% salt solution for two minutes?

• It will shrink/ wilt.

• It will swell/ rupture

• It will change colors

• It will remain unchanged

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-5

The diagram to the right shows the same type of molecule on side A and side B.  According to diffusion, which direction will the molecules move?

• Molecules move towards B until equilibrium is reached

• Molecules move towards A

• Molecules won’t move

• All of the molecules will explode

You are conducting osmosis experiments with a test tube of human cells in solution.  You pour table salt into the test tube.  According to the principles of osmosis, what can you predict will happen to the cells? 

• They will swell and burst

• They will not be affected.

• They will shrink and shrivel.

• They will undergo rapid mitosis.

Tags

NGSS.MS-LS1-5

Placing wilted cabbage  in cold water will make it crisp again. Which statement best describes what happens to restore the cabbage to its original condition?

•  Water left the cabbage cells by diffusion

• Water entered the cells of the cabbage by osmosis

• Osmosis caused salts to enter the cabbage cells.

• Salts in the cabbage leaf caused water to leave the cells.

Tags

NGSS.MS-LS1-2

Which is an example of osmosis?

• potassium ions moving in and out of an animal cell

• carbon dioxide moving into the leaf cells of a plant

• oxygen moving into the bloodstream from the lungs

• water moving into the root cells of a plant

Tags

NGSS.MS-LS2-1

According to the diagram of an animal cell, which numbered structure represents the cell membrane?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-LS1-2

Sweating while hot and shivering while cold are examples of what characteristic of life?

• Living things grow and develop.

• Living things are based on a universal genetic code.

• Living things maintain a stable internal environment.

• Living things obtain and use materials and energy.