1. a). The presence of this substance will determine whether yeast will use resp
ID: 221198 • Letter: 1
Question
1.
a). The presence of this substance will determine whether yeast will use respiration or fermentation pathway for energy production.
glucose
sucrose
carbon dioxide
oxygen
water
b). The advantage of respiration over fermentation is that respiration:
produces more energy
uses less sugar fuel
can be carried out in the absence of oxygen
requires water
c). The advantage of fermentation over respiration is that fermentation:
produces more energy
uses less sugar fuel
can be carried out in the absence of oxygen
requires water
d). As the alcohol content of beer increases, the _____ also increases.
water content
oxygen
sugar
caloric value
yeast
glucose
sucrose
carbon dioxide
oxygen
water
Explanation / Answer
1. Some cells that usually obtain energy from aerobic cellular respiration can use fermentation when oxygen is not available. So, the presence and absence of oxygen will determine whether yeast will use respiration or fermentation pathway for energy production. The correct answer is oxygen.
2. A major advantage of aerobic respiration is the amount of energy it releases. Without oxygen, organisms can split glucose into just two molecules of pyruvate. This releases only enough energy to make two ATP molecules. With oxygen, organisms can break down glucose all the way to carbon dioxide. So, the correct answer is produces more energy.
3. Fermentation can takes place in oxygen-limiting environment. This is its biggest advantage aginst cellular respiration. So, the correct answer is option c.
4. The alcohol content of beer can be increased by adding more sugar, which ultimately lead to increase in caloric value of the alcohol produced.
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