In yeast, ethanol is produced from glucose under anaerobic conditions. What is t
ID: 916435 • Letter: I
Question
In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions?
a. A cell-free yeast extract is placed in a solution that contains 2.50 × 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. It is kept under anaerobic conditions. 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?
b. Under the same conditions, what is the theoretical maximum amount of glucose (mmol) required in the solution to form the maximum amount of ethanol?
Explanation / Answer
C6H12O6 -------------> 2C2H5OH + 2 CO2
hence one molecule glucose will 2 molecule of Ethanol
glucose concentration = 2.50 × 102 mmol
= 2.50 × 102 x 180.16 = 4.5 x 104 gm or 45 kg
Maximum it can produce (2.50 × 102 x 2) 5 x 102 mmols of ethanol
5 x 102 mmols of ethanol = 5 x 102 x 46.068 = 2.3 x 104 gm or 23 kg of ethanol
Hence Minimum 45KG glucose is need to produce 23KG ethanol