Cell Transport: Pre-Test

What structure is essential for the transport of specific large molecules in and out of cells? (based on the diagram shown)

• w

• x

• y

• z

What is shown in the area labeled Z?

• carrier proteins

• lipid bilayer

• protein bilayer

• receptor proteins

This diagram shows a red blood cell in a beaker that contains a solution with a higher salt concentration than that inside the red blood cell.

What will happen to the red blood cell in this environment?

• The size of the red blood cell will remain constant.

• The red blood cell will swell at first and then shrink.

• The red blood cell will swell from absorbing salt molecules.

• The red blood cell will shrink from losing water molecules.

Tags

NGSS.HS-LS1-3

Which process requires the use of energy by the cell?

• passive transport

• osmosis

• active transport

• diffusion

The diagram illustrates the use of energy by a nerve cell to expel a sodium ion from inside of the cell.

Which BEST explains why energy is necessary to complete this function?

• The ion is being transported against a concentration gradient.

• The ion has more kinetic energy than surrounding molecules.

• The ion is a waste product that is digested by the cell membrane.

• The ion is too large to pass through the cell membrane by diffusion.

What would happen if there were no difference in concentration between a cell and its environment?

• The rate of diffusion would decrease between the cell and its environment.

• Molecules would stop moving, and freeze.

• The rate of diffusion would increase between the cell and its environment.

• The cell would be in equilibrium with its environment.

Examine the diagram that shows a container divided into sections

by a membrane which is permeable ONLY to water:

What will happen to the container over time?

• Diffusion will not take place so the concentration of water and sugar will stay the same.

• The water will diffuse from section 2 into section 1 until the concentration of water is balanced.

• The water will diffuse from section 1 into section 2 until the concentration of water is balanced.

• The sugar will DIFFUSE from section 2 into section 1 until the concentration of sugar is balanced.

Which example best demonstrates diffusion?

• cellular movement

• an amoeba engulfing a bacterium

• when a drop of dye spreads out in a beaker of water

• a contractile vacuole removing excess water

Tags

NGSS.HS-PS1-5

Which of the following is the best description of the plasma membrane?

• Allows some materials to pass in and out of the cell

• Allows nothing to pass in and out of the cell

• Allows everything to pass in and out of the cell

• Only allows substances to move with the concentration gradient

Which of these processes makes it possible for cells to take in water?

• osmosis

• mitosis

• photosynthesis

• respiration