AP Biology Membrane transport part1 Quiz

As a result of diffusion, the concentration of many types of substances

• always remains greater inside a membrane.

• eventually becomes balanced on both sides of a membrane.

• always remains greater on the outside of a membrane.

• becomes imbalanced on both sides of a membrane.

Diffusion takes place

• only through a lipid bilayer membrane.

• from an area of low concentration to an area of high concentration.

• only in liquids.

• from an area of high concentration to an area of low concentration.

Refer to the illustration above. Which cell is most likely to lose both water molecules and solute molecules as the system approaches equilibrium?

• cell 1

• cell 2

• cell 3

• cell 4

Refer to the illustration above. In this system, solute molecules in cell 2 are most likely to

• remain in cell 2.

• adhere to cell 2’s membrane.

• diffuse into cell 1.

• diffuse into cell 4.

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NGSS.MS-LS1-3

Refer to the illustration above. In which direction are water molecules in this system most likely to diffuse?

• from 1 to 2

• from 2 to 4

• from 4 to 3

• from 3 to 1

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NGSS.MS-LS1-2

The dispersal of ink in a beaker of water is an example of

• diffusion.

• osmosis.

• active transport.

• endocytosis.

Sugar molecules can enter cells through the process of

• exocytosis.

• facilitated diffusion.

• osmosis.

• ion pumps.

Channels utilizing facilitated diffusion

• (a) work in two directions.

• (b) require an electrical signal to function.

• (c) Both a and b

• (d) None of the above

Which of the following is not characteristic of facilitated diffusion?

• It requires a carrier protein.

• It moves substances against a concentration gradient.

• It requires no energy input.

• It involves a change in the shape of its carrier.

Which of the following is true of ions and their transport across cell membranes?

• The “gates” for ion channels are always open.

• Ion channels always allow any type of ion to pass through them.

• Electrical or chemical signals may control the movement of ions across cell membranes.

• Because they are charged particles, the movement of ions across cell membranes requires energy input.