Question

Which of the following are features of facilitated diffusion? There may be more than one correct answer, select all that apply.

a. Depends on ATP hydrolysis
b. Can include ion transport down its concentration gradient in a cell (high to low concentration)
c. Requires energy
d. Movement assisted by proteins
e. Can include passive diffusion

Answer 1

Option b and d are the correct answer. Facilitated diffusion features the transport of ions down their concentration gradient in a cell and the movement of molecules assisted by proteins, without the use of ATP hydrolysis or additional energy.

Step-by-step explanation:

Which of the following are features of facilitated diffusion? The correct answers are:

• Can include ion transport down its concentration gradient in a cell (high to low concentration)
• Movement assisted by proteins

Facilitated diffusion is a process in which molecules move down their concentration gradient through specific protein channels or carriers within the cell membrane. This process does not depend on ATP hydrolysis and does not require additional energy, distinguishing it from active transport mechanisms that do require energy. Instead, facilitated diffusion leverages the inherent free energy in concentration gradients to move substances across the membrane, with the transport proteins providing a pathway that allows polar and charged molecules to bypass the lipid bilayer's hydrophobic core.