Question

multiple choice question
molecules crossing a plasma membrane from a ____ concentration to a ____ concentration is an example of passive diffusion.

• high / low
• low / low
• low / high
• high / high

Explanation:

Passive diffusion is a type of passive transport where molecules move across a plasma membrane down their concentration gradient, meaning from an area of higher concentration to an area of lower concentration, without requiring energy input.

Answer:

A. high / low