Fatty acid molecules can align to form a barrier called a bilipid ...

[dollx]

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.

Question 2

Which of the following statements does not describes the similarity between soaps and detergents?
 
  A) They have a polar ionic end and a long nonpolar tail.
  B) Both dissolve oils.
  C) Both are synthetic.
  D) Both are biodegradable.
  E) Both are made from fatty acids.

[izzat]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: E

[dollx]

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