Multiple Choice
How does facilitated diffusion differ from simple diffusion?
273
views
6. The Membrane
Simple and Facilitated Diffusion
Struggling with General Biology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is facilitated diffusion?
A
The passive movement of molecules directly through the lipid bilayer without the aid of proteins.
B
The active transport of molecules against their concentration gradient using ATP.
C
The movement of water molecules through a semipermeable membrane.
D
The passive movement of molecules across a cell membrane via specific transmembrane proteins.
Verified step by step guidance1
Facilitated diffusion is a type of passive transport, meaning it does not require energy input from the cell.
In facilitated diffusion, molecules move across the cell membrane with the help of specific transmembrane proteins, such as channel proteins or carrier proteins.
These proteins provide a pathway for certain molecules or ions to pass through the lipid bilayer, which they cannot do directly due to their size, charge, or polarity.
The movement of molecules in facilitated diffusion is down their concentration gradient, from an area of higher concentration to an area of lower concentration.
This process is crucial for the transport of substances like glucose and ions, which are essential for cellular function but cannot diffuse freely through the lipid bilayer.
5:10mWatch next
Master Simple and Facilitated Diffusion with a bite sized video explanation from Jason
Start learningRelated Videos
Related Practice
Simple and Facilitated Diffusion practice set
Problem sets built by lead tutorsExpert video explanations