Fatty Acid Molecules Can Align to Form a Barrier Called

question 39

Multiple Choice

Fatty acid molecules can align to form a barrier called a bilipid layer,shown below.In this schematic,the ionic end of the fatty acid is shown as a circle and the nonpolar chain is shown as a squiggly line. From the schematic above: why do nonpolar molecules have a difficult time passing through the bilipid layer?

• A)The nonpolar molecules are too large for the space through which they need to pass.
• B)The nonpolar molecules are repelled by the polar water molecules.
• C)The nonpolar molecules have a difficult time getting past the ionic heads of the fatty acid molecules,which are surrounded by water molecules.
• D)Nonpolar molecules tend to bind with the bilipid layer,thus inhibiting their passage.

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