A) rarely anaerobic
B) anaerobic
C) purely aerobic
D) Both (a) and (b)
Correct Answer: D
Solution :
Yeast is a facultative aerobe. When yeast is grown in a well aerated (aerobic) nutrient medium, the sugar is completely oxidised in normal respiration. \[\underset{glu\cos e}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}+6{{O}_{2}}}}\,\xrightarrow[{}]{{}}6C{{O}_{2}}+6{{H}_{2}}O+Energy\] Energy glucose ethyl alcohol But in anaerobic condition, sugar is converted into \[C{{O}_{2}}\] and ethyl alcohol \[({{C}_{2}}{{H}_{5}}OH)\]within the cytoplasm. \[\underset{glu\cos e}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}\,+Yeast\xrightarrow[{}]{{}}\underset{ethyl\,alcohol}{\mathop{2{{C}_{2}}{{H}_{5}}OH}}\,+C{{O}_{2}}+Energy\]
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