Multiple Choice
Simple diffusion and facilitated diffusion across a membrane both ___________________:
11. Biological Membranes and Transport
Passive Membrane Transport
Struggling with Biochemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
The difference between simple and facilitated diffusion is that facilitated diffusion:
A
Requires a protein transporter.
B
Moves molecules against their concentration gradient.
C
Requires energy.
D
Freely diffuses molecules against their concentration gradient.
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. This process does not require energy and occurs due to the random motion of molecules.
Differentiate between simple and facilitated diffusion: Simple diffusion occurs directly across the phospholipid bilayer without the aid of any proteins, while facilitated diffusion requires the assistance of membrane proteins.
Identify the role of protein transporters in facilitated diffusion: Facilitated diffusion involves specific proteins, such as channel proteins or carrier proteins, that help transport molecules across the cell membrane.
Clarify the energy requirement: Facilitated diffusion does not require energy (ATP) because it moves molecules down their concentration gradient, not against it.
Recognize the correct statement: Facilitated diffusion requires a protein transporter to move molecules across the cell membrane, but it does not require energy and does not move molecules against their concentration gradient.
4:17mWatch next
Master Passive Membrane Transport with a bite sized video explanation from Jason
Start learningRelated Videos
Related Practice
Passive Membrane Transport practice set
Problem sets built by lead tutorsExpert video explanations