LMS Cell Membrane Practice

One student compares the cell membrane to a solid brick wall encasing the cell. A second student compares the cell membrane to a fence with several gates encasing the cell.

Which student’s analogy is a better representation of the cell membrane?

• Solid brick wall; the cell membrane keeps everything out of the cell to keep the cell healthy.

• Solid brick wall; the cell membrane is very thick and rigid.

• Fence with gates; the cell membrane is easy to break through and releases wastes through gates.

• Fence with gates; the cell membrane allows particles to diffuse or travel through designated areas.

Dylan is conducting an experiment in science class. The teacher gave Dylan a raw egg with the shell removed. Without the shell, Dylan observes that the egg is surrounded by a membrane. Dylan gently placed the egg into a solution. Below is a diagram of the concentration of water molecules in the egg and in the solution.

• A

  The egg will swell because water molecules will move into the egg until the concentrations are equal.

• • B

  • The egg will swell because water molecules will move into the egg until all the water molecules are inside the egg.

• • C

  • The egg will shrink because water molecules will move out of the egg until the concentrations are equal.

• • D

    The egg will shrink because water molecules will move out of the egg until all the water molecules are in the solution.

To investigate the effect of salt water on a cell, a researcher places one cell sample in freshwater and a second cell sample in salt water. After six hours, the researcher observes and sketches the two cells as shown.

What change in the cells occurred during the six hours the cells remained undisturbed?

• • A

    Osmosis occurred in the salt water cell sample because the water from inside the cell moved out of the cell to a lower concentration, causing the cell to shrink.

• • B

  • Osmosis occurred in the freshwater cell sample because the water from outside the cell moved into the cell to a higher concentration, causing the cell to grow.

• • C

  • Osmosis occurred in the salt water cell sample because the salt from outside the cell moved into the cell to a lower concentration, causing the cell to shrink.

• • D

    Osmosis occurred in the freshwater cell sample because the salt from inside the cell moved out of the cell to a higher concentration, causing the cell to grow.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-5

The diagram shows oxygen moving into an animal cell.

Which statement best describes the cell after this process has occurred?

• • A

    The concentration of oxygen will be higher inside the cell compared to outside the cell.

• • B

    The concentration of oxygen will be lower inside the cell compared to outside the cell.

• • C

    The concentration of oxygen inside and outside the cell will be nearly equal.

• • D

    The concentration of oxygen inside the cell will be minimal or zero.

Tags

NGSS.MS-LS1-2

A cell is placed in a salt solution that has the same concentration as the inside of the cell. What will happen to the cell?

• The cell will contract.

• The cell will expand slightly.

• The cell will burst.

• The cell will remain the same size.

Tags

NGSS.MS-LS1-2

In the previous question, a cell was placed in a solution that had the same concentration as the inside of the cell. The cell did not change size. This is because the cell was in _________ with its environment.

• Equilibrium

• disequilibrium

• cahoots

• imbalance

What is the primary function of the cell membrane in controlling the movement of substances?

• To allow all substances to freely enter and exit the cell.

• To prevent any substances from entering or leaving the cell.

• To selectively allow certain substances to pass through while blocking others.

• To actively transport all substances into the cell without regulation.

Tags

NGSS.MS-LS1-2

If a cell is placed in an isotonic solution, how will the volume of the cell change over time?

• The cell will swell as water enters the cell.

• The cell will shrink as water leaves the cell.

• The cell volume will not change as there is no net movement of water.

• The cell will first shrink, then swell as water moves in and out.

Tags

NGSS.MS-LS1-2

Why are plant cells capable of making their own food but not animals cells? Because of the presence of the

• mitochondria

• chloroplast

• cytoplasm

• nucleus

Tags

NGSS.MS-LS1-6

Controls what comes into and out of the cell; found in plant and animal cells

• cell membrane

• chloroplast

• cytoplasm

• nucleus

Tags

NGSS.MS-LS1-2