A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose, readily moves through the membrane. What might account for the inability of glucose to move through the artificial membrane?
A. The artificial membrane lacked the appropriate types of phospholipids for glucose transport.
B. The membrane lacked an adequate amount of amphipathic molecules for glucose transport.
C. Thermodynamics does not allow glucose to pass through membranes produced either artificially or from living organisms.
D. The artificial membrane lacked a protein needed for glucose transport.
E. Oxygen readily passes through the membrane, so glucose should have as well.
Answer: D
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