Question

Some types of beer are bottled with yeast. These beers are not carbonated at bottling but if you open them a few weeks later, they bubble Explain the source of this carbonation. Briefly explain how the Citric Acid cycle generates CO2, ATP, NADH and FADH₂ Give the total theoretical yield of each of these molecules during this cycle for one glucose molecule oxidized.

Answer 1

The beers are not carbonated at the bottling plant but are added with some amount of yeast with some quantity of sugar so that the yeast can feed on the sugar and produce carbon dioxide and alcohol, so that's why carbonation is not done during the bottling as yeast is able to produce CO2 by itself.

The bubbles that get generated after a week are due to the yeast as it consumes sugar and produces CO2 and alcohol.