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

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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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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