A Home Brewer Accidentally Heats His Brew During Fermentation, Briefly $\degree$

A home brewer accidentally heats his brew during fermentation, briefly increasing the temperature to around 65 $\degree$ C. At the end of the brewing process the brewer decides to celebrate by getting rip-roaring drunk. He drinks a dozen bottles of beer and only succeeds in feeling sick. What went wrong?

A) The temperature spike caused the ethanol to evaporate.
B) The energy pathways of yeast are temperature dependant, thus the increase in temperature caused the yeast to switch from fermenting sugars to gluconeogenesis via fatty-acid metabolism.
C) Warmer water resulted in thermal currents within the brew, displacing and disturbing the yeast culture.
D) The temperature spike killed the yeast, resulting in no ethanol production.
E) Under higher temperatures, the ethanol chemical reverts to isopropyl-alcohol.

Correct Answer:

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