Multiple Choice
In eukaryotic cells, which structure is selectively permeable, allowing some substances to cross while restricting others?
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8. Membrane Structure
The Lipid Bilayer
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In the context of the lipid bilayer, what is the hydrophilic head of a phospholipid primarily made of?
A
A phosphate-containing polar group attached to glycerol
B
A polymer of amino acids forming a polar peptide headgroup
C
A cholesterol ring structure with a short hydrocarbon tail
D
Two nonpolar fatty acid hydrocarbon chains
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