What characteristic of phospholipids accounts for their packing into a double layer?
A) That they are amphipathic, containing a hydrophobic end and a hydrophilic end.
B) That they are amphipathic, containing only hydrophilic structures.
C) That they contain saturated fatty acids.
D) That they contain unsaturated fatty acids.
E) That they have rigid steroid ring structures.
Answer: A
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