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Yeast lees left in contact with a wine after fermentation contribute chiefly by

  • A.Raising the alcohol content by several per cent
  • B.Releasing compounds that add texture and complexity
  • C.Restarting the alcoholic fermentation from the beginning
  • D.Removing all the colour from a finished red wine

Answer: B

As the dead cells break down they release mannoproteins and other compounds that give a rounder mouthfeel and added complexity, which is why some wines are deliberately aged on their lees. The yeast is no longer fermenting anything.

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