Question

Does yeast need oxygen in fermentation process?

(a) True

(b) False

The question was asked in quiz.

I'd like to ask this question from Estimating Oxygen Solubility in portion Mass Transfer of Bioprocess Engineering

Answer 1

Correct choice is (a) True

The explanation is: Oxygen is a critical additive in brewing. Oxygen is the only necessary nutrient not naturally found in wort. Adding adequate oxygen to wort requires a fundamental understanding of why yeast need oxygen, how much oxygen they need, and how to get oxygen into solution and the factors affecting solubility of oxygen. Yeast use oxygen for cell membrane synthesis. Without oxygen, cell growth will be extremely limited. Yeast can only produce sterols and certain unsaturated fatty acids necessary for cell growth in the presence of oxygen.