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Lipids quiz

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  • What is the characteristic ring structure found in all sterols?
    All sterols have a fused ring structure consisting of three 6-membered rings and one 5-membered ring.
  • Which sterol is predominant in humans and which in fungi?
    Cholesterol is the main sterol in humans, while ergosterol is the main sterol in fungi.
  • How does increasing the number of double bonds in fatty acids affect membrane fluidity?
    Increasing the number of double bonds in fatty acids increases membrane fluidity by lowering the melting point.
  • What is the effect of temperature on membrane fluidity?
    Increasing temperature increases membrane fluidity, while decreasing temperature decreases it.
  • Why do organisms in colder climates have more unsaturated fatty acids in their membranes?
    They have more unsaturated fatty acids to maintain membrane fluidity at lower temperatures.
  • What is the main structural difference between sphingolipids and glycerophospholipids?
    Sphingolipids contain sphingosine as a backbone, while glycerophospholipids have glycerol.
  • Where is cardiolipin primarily found?
    Cardiolipin is primarily found in mitochondrial and bacterial membranes.
  • What is the role of arachidonic acid in the body?
    Arachidonic acid is a fatty acid precursor to prostaglandins, which are important eicosanoids in signaling.
  • Are fatty acids constituents of sterols?
    No, sterols have a fused ring structure and do not contain fatty acids as constituents.
  • Are all fatty acids unsaturated?
    No, some fatty acids are saturated (no double bonds), while others are unsaturated (one or more double bonds).
  • What is the hydrophobic or hydrophilic nature of fatty acids?
    Fatty acids are strongly hydrophobic due to their long hydrocarbon chains.
  • What is the backbone of a glycerophospholipid?
    The backbone of a glycerophospholipid is glycerol.
  • Which position on glycerol is most likely to have an unsaturated fatty acid in a phospholipid?
    The unsaturated fatty acid is most likely to be at position 2 on the glycerol backbone.
  • What is the structure of dodecanoic acid?
    Dodecanoic acid is a saturated fatty acid with 12 carbons and no double bonds.
  • What is the structure of palmitoleic acid?
    Palmitoleic acid is a fatty acid with 16 carbons and one double bond between carbons 9 and 10.