In the context of membrane transport, what is the role of channel proteins?
A.
A. To actively transport molecules against their concentration gradient.
B.
B. To provide structural support for the cell membrane.
C.
C. To form vesicles for the transport of large molecules.
D.
D. To form pores for the passive movement of molecules down their concentration gradient.
Exam No：AP Biology Problem Set 4 Year：2024 Question No：AP Biology2024AP0337
Answer:
D
Knowledge points:
2.7 Facilitated Diffusion
Solution:
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