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The crabtree effect is the repression of respiration.

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The crabtree effect is the repression of respiration.

(a) True

(b) False

This question was posed to me in exam.

This interesting question is from Aerobic Bioprocesses topic in section Mixed Cultures & Traditional Industrial Bioprocesses of Bioprocess Engineering

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Right choice is (a) True

Easy explanation: The Crabtree effect describes the phenomenon whereby the yeast, Saccharomyces cerevisiae, produces ethanol(alcohol) in aerobic conditions and high external glucose concentrations rather than producing biomass via the tricarboxylic acid (TCA) cycle, the usual process occurring aerobically in most yeasts. The crabtree effect works by repressing respiration by the fermentation pathway, dependent on the substrate. The occurrence of alcoholic fermentation is not primarily due to a limited respiratory capacity.

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