Question

3.2.4 Quiz: Cellular Transport

Question 4 of 10

Hydrogen ions move through the membrane protein shown below when the protein changes shape.

H

H+

H

H

Which process takes place if the hydrogen ions move without the help of additional energy?

OA. Facilitated diffusion

OB. Active transport

OC. Reverse osmosis

OD. Simple diffusion

Answer 1

Answer: OA. Facilitated diffusion.

Step-by-step explanation:

The movement of ions or molecules across a cell membrane without the need for energy input is known as passive transport. Among the options provided:

Facilitated diffusion is a type of passive transport where molecules or ions move across the cell membrane with the help of specific transport proteins, without any additional energy input.

Active transport requires energy to move molecules or ions against their concentration gradient.

Reverse osmosis is a process used to purify or desalinate water by forcing it through a semipermeable membrane.

Simple diffusion is the movement of molecules from an area of high concentration to an area of low concentration without the need for any transport protein.

Given the information that hydrogen ions move through a membrane protein without the help of additional energy, the correct answer is:

OA. Facilitated diffusion.