ABCTE Biology Practice Exam 2025 - Free ABCTE Biology Practice Questions and Study Guide

Question: 1 / 400

During facilitated transport, intrinsic proteins assist molecules in moving:

From high to low concentrations

Facilitated transport, also known as facilitated diffusion, is a process where intrinsic proteins, or transport proteins, help certain molecules move across the plasma membrane. This movement occurs specifically from an area of higher concentration to an area of lower concentration, which aligns with the natural tendency of molecules to spread out to achieve equilibrium.

The proteins involved do not require energy (ATP) for this process, as they are utilizing the concentration gradient that exists naturally. This is distinct from processes that would involve moving molecules against their concentration gradient, which would require energy input. Hence, the correct interpretation of facilitated transport is that it supports the passive movement of substances down their concentration gradient, which is from high to low concentrations.

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Against the concentration gradient

Through the plasma membrane using energy

From low to high concentrations

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