In yeast, ethanol is produced from glucose under anaerobic conditions. What is t
ID: 40362 • Letter: I
Question
In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in m that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that contains 3.50 x 102 mmol glucose, 0.40 mmol ADP, 0.40 mmol Pi, 0.80 mmol ATP, 0.20 mmol NAD and 0.20 mmol NADH. It is kept under anaerobic conditions. Incorrect Number The NAD used during glycolysis and converted to NADH is mmol replenished during fermentation. Neither NAD nor NADH is limiting. Under the same conditions, what is the theoretical minimum amount of glucose (in millimoles) required in the solution to form the maximum amount of ethanol? Number mmolExplanation / Answer
A cell-free yeast extract is placed in a solution that contains 3.50*10^2 mmol glucose, 0.40 mmol ADP, 0.40 mmol Pi, 0.80 mmol ATP, 0.20 mmol NAD+, and 0.20 mmol NADH. If it is kept under anaerobic conditions then the yield of ethanol from glucose is typically 95% of the theoretical yields.
Since ADP is the limiting reagent, the max ethanol produced would be .40 mmol.
The theoretical minimum amount of glucose is half of the ADP, so it is .20mmol.