Question

Yeast is only restricted to aerobic fermentation.

(a) True

(b) False

This question was posed to me in an interview for job.

The query is from Aerobic Bioprocesses in section Mixed Cultures & Traditional Industrial Bioprocesses of Bioprocess Engineering

Answer 1

Right choice is (b) False

The explanation is: Yeast can use any of three major metabolic modes: aerobic fermentation in the presence of sugar and oxygen, anaerobic fermentation in the presence of sugar but absence of oxygen, and respiration (necessarily aerobic) in the presence of oxygen and a low concentration of fermentable sugar.