In an aqueous environment, the phospholipids of a membrane ____
a. are arranged in a single layer
b. are arranged in a bilayer with the polar heads of each layer located at the membrane surface
c. are arranged in a bilayer with the fatty acid tails located at the membrane surface
d. are arranged in a bilayer but the phospholipids have no specific orientation
e. dissociate into their lipid and protein components
ANSWER: b
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