Which of the following fatty acids, if incorporated into a typical eukaryotic membrane phospholipid, would be the most likely to increase that membrane’s fluidity?

Human Anatomy & Physiology (11th Edition)
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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Which of the following fatty acids, if incorporated into a typical eukaryotic membrane phospholipid, would be the most likely to increase that membrane’s fluidity? 

  1. linolenic acid, with 18 carbons and three carbon-to-carbon double bonds
  2. linoleic acid, with 18 carbons and two carbon-to-carbon double bonds
  3. oleic acid, with 18 carbons and one carbon-to-carbon double bond
  4. stearic acid, with 18 carbons and no carbon-to-carbon double bonds
  5. all of the above molecules are unsaturated, and equally likely to increase membrane fluidity
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