Some friends are trying to make wine in their basement. They've added yeast (which is a facultative anaerobe - it can perform both aerobic respiration and fermentation) to a sweet grape juice mixture and have allowed the yeast to grow. After several days they find that sugar levels in the grape juice have dropped, but there's no alcohol in the mixture. The most likely explanation is that     the mixture needs less oxygen, because yeast only produce alcohol in the absence of oxygen   the mixture needs less sugar, because high sugar concentrations prevent fermentation   the mixture needs more sugar, because yeast need a lot of energy before they can begin to produce alcohol   the yeast used the alcohol as a carbon source   the mixture needs more oxygen, because yeast need oxygen to break down sugar and get enough energy to produce alcohol

Curren'S Math For Meds: Dosages & Sol
11th Edition
ISBN:9781305143531
Author:CURREN
Publisher:CURREN
Chapter10: Reconstitution Of Powdered Drugs
Section: Chapter Questions
Problem 6.4P
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Some friends are trying to make wine in their basement. They've added yeast (which is a facultative anaerobe - it can perform both aerobic respiration and fermentation) to a sweet grape juice mixture and have allowed the yeast to grow. After several days they find that sugar levels in the grape juice have dropped, but there's no alcohol in the mixture. The most likely explanation is that

 
 
the mixture needs less oxygen, because yeast only produce alcohol in the absence of oxygen
 
the mixture needs less sugar, because high sugar concentrations prevent fermentation
 
the mixture needs more sugar, because yeast need a lot of energy before they can begin to produce alcohol
 
the yeast used the alcohol as a carbon source
 
the mixture needs more oxygen, because yeast need oxygen to break down sugar and get enough energy to produce alcohol
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