AP®︎ Biology: Topic 2.6 Practice Test
Prepare for your quiz, test, or the AP exam with focused practice questions on Topic 2.6 of AP Biology – Facilitated Diffusion.
Questions List
Topic 2.6
Question 1 Easy
This question tests the following: ENE-2.F.1
What role does the cell membrane primarily serve?
What You’re Being Tested On:
Explore the learning objectives taken directly from the College Board’s AP® Biology Curriculum. Ensure you’re prepared for the exact topics covered on the AP® exam, in-class tests, and quizzes, and gain confidence in your mastery of the material.
Topic 2.6: Facilitated Diffusion
Learning Objective: 2.6.A
Explain how the structure of a molecule affects its ability to pass through the plasma membrane.
Essential Knowledge: 2.6.A.1
Facilitated diffusion requires transport or channel proteins to enable the movement of charged ions across the membrane. i. Membranes may become polarized by the movement of ions across the membrane. ii. Charged ions, including Na⁺ (sodium) and K⁺ (potassium), require channel proteins to move through the membrane.
Essential Knowledge: 2.6.A.2
Facilitated diffusion enables the movement of large polar molecules through membranes with no energy input. In this type of diffusion, substances move down the concentration gradient.
Essential Knowledge: 2.6.A.3
Aquaporins transport large quantities of water across membranes.
