Question

Facilitated Diffusion Requires which of the following? Select all that apply.
Group of answer choices

Transport proteins

ATP

A concentration gradient

Kinetic energy

Answer 1

Facilitated diffusion requires the following:

1. **Transport proteins** - Facilitated diffusion uses specific transport proteins to help move substances across the cell membrane.
2. **A concentration gradient** - Facilitated diffusion occurs down a concentration gradient, meaning substances move from an area of higher concentration to an area of lower concentration.
3. **Kinetic energy** - While not used directly as an energy source like ATP, the process of facilitated diffusion relies on the kinetic energy of molecules as they move down the concentration gradient.

**ATP** is not required for facilitated diffusion, as this process does not involve the input of energy; it is a passive transport mechanism.

So, the correct answers are:
- Transport proteins
- A concentration gradient
- Kinetic energy