APFIVE Phospholipid Bilayer Permeability
In a laboratory experiment, students observe that adding a specific protein to a phospholipid vesicle causes the vesicle to become permeable to glucose but not to larger molecules. Which structural feature of phospholipids best explains why the protein was necessary for glucose transport?
A
The glycerol backbone creates steric hindrance
B
The phosphate heads repel all biological molecules
C
The fatty acid tails are too rigid to allow any passage
D
The hydrophobic core prevents passage of polar molecules
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