Biology · Respiration in Plants

What is the maximum energetic efficiency and natural physiological alcohol tolerance limit for yeasts during anaerobic alcoholic fermentation?

1. A
   More than 40% of glucose energy trapped as ATP; yeasts tolerate up to 25% alcohol concentration.
2. B
   Approximately 18% of energy trapped as ATP; yeast cells lyse at exactly 5% ethanol.
3. C
   Less than 7% of glucose energy released/trapped; yeasts poison themselves to death when alcohol concentration reaches about 13%.
4. D
   Zero energy is trapped as ATP; yeasts can tolerate pure 100% ethanol under anaerobic conditions.