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Saccharomyces pastorianus is understood to be

  • A.A bacterium rather than a yeast despite its name
  • B.A mould closely related to the genus Penicillium
  • C.A hybrid of an ale yeast with Saccharomyces eubayanus
  • D.A strain of Saccharomyces cerevisiae with no other parent

Answer: C

Genome studies show it to be an interspecies hybrid, which explains its ability to work at temperatures far below those an ale yeast tolerates. The cold-tolerant parent, Saccharomyces eubayanus, was identified long after the yeast had been in use.

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