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Home Q & A Board Biology-Related Homework Help Cell Biology
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itzresonance itzresonance
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6 years ago
Below is a list of molecules with different chemical characteristics.
 
  Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the option below that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest).
 
   alanine estrogen propanol sodium
 
  (a) alanine > propanol > sodium > estrogen
  (b) sodium > propanol > alanine > estrogen
  (c) estrogen > propanol > sodium > alanine
  (d) estrogen > propanol > alanine > sodium
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#1
6 years ago
(d) Estrogen is a steroid hormone and will diffuse the fastest across the membrane. Propanol is a small, uncharged molecule with a polar group. Alanine is an amino acid, and although it has a small, nonpolar side group, amino acids are charged molecules. Sodium is an ion and will move the slowest across the bilayer.
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