AP Biology : Understanding Types of Cellular Junctions

Study concepts, example questions & explanations for AP Biology

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Example Questions

Example Question #11 : Understanding Types Of Cellular Junctions

Which process involved in cellular respiration is defined as the movement of solutes across a plasma membrane from a region of higher solute concentration to a region of lower solute concentration with the aid of proteins?

Possible Answers:

Osmosis

Plasmolysis

Bulk flow

Facilitated diffusion

Active transport

Correct answer:

Facilitated diffusion

Explanation:

The answer to this question is facilitated diffusion.

Facilitated diffusion involves the movement down a concentration across a plasma membrane without ATP. Bulk flow is a completely different process and active transport is the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy. Active transport needs an input of energy, unlike facilitated diffusion. Osmosis is the simple diffusion of water.

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