Problem: Which three of the following statements are true?a) The bilayer of a cellular membrane is primarily composed of amphipathic (amphiphilic) lipids.b) Polar molecules with small nonpolar regions (e.g. acetic acid) readily form micelles. c) The tendency of hydrophobic molecules to aggregate in water is called the hydrophobic effect.d) Placing a hydrophobic molecule into water disrupts some of the water-water hydrogen bonds. e) Forming an ordered network of water around hydrophobic molecules increases the entropy of water. 

FREE Expert Solution

Analyzing each choice:

a) The bilayer of a cellular membrane is primarily composed of amphipathic (amphiphilic) lipids.

  • Cellular membrane has polar + non-polar groups but mainly it is composed of the non-polar/amphipatic lipids
  • This is correct

b) Polar molecules with small nonpolar regions (e.g. acetic acid) readily form micelles. 

  • Nonpolar regions are necessary for micelle formation 
  • The bigger the non-polar group, the greater the micelle/aggregation
  • This is incorrect

c) The tendency of hydrophobic molecules to aggregate in water is called the hydrophobic effect.

  • This is correct
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Problem Details

Which three of the following statements are true?

a) The bilayer of a cellular membrane is primarily composed of amphipathic (amphiphilic) lipids.

b) Polar molecules with small nonpolar regions (e.g. acetic acid) readily form micelles. 

c) The tendency of hydrophobic molecules to aggregate in water is called the hydrophobic effect.

d) Placing a hydrophobic molecule into water disrupts some of the water-water hydrogen bonds. 

e) Forming an ordered network of water around hydrophobic molecules increases the entropy of water. 

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