The critical factor driving yeast to use fermentation to metabolize sugar is?

Question

a inability to carry on glycolosis

b lack of oxygen

c lack of any enzymes

d that yeast is intolerant to alchohol

e that yeast can secure 38 ATP molecules from fermentation

Answer 1

B.  Lack of oxygen.  If O2 is available, yeast will conduct aerobic respiration yielding more energy for growth.

Answer 2

B page 101

Answer 3

The correct answer is B. Yeast possess mitochondria and so they will burn sugar to CO2 and water if oxygen is available, and these are not nearly as fun or as useful as Ethanol.