LABORATORY REVIEW
CELL RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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glycolysis:no oxygen required
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fermentation:oxygen required
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Krebs Cycle:no oxygen required
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None of the above
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Detailed explanation-1: -Fermentation take place when there is a lack of oxygen in a cell. Without oxygen, the only process that can create ATP from glucose is glycolysis. However, NADH is created during glycolysis, and must be turned back to in order to continue metabolizing glucose with glycolysis.
Detailed explanation-2: -Glycolysis, which is the first step in all types of cellular respiration is anaerobic and does not require oxygen. If oxygen is present, the pathway will continue on to the Krebs cycle and oxidative phosphorylation.
Detailed explanation-3: -So, oxygen is important for both inspiration and combustion.
Detailed explanation-4: -The other three stages of cellular respiration-pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation-require oxygen in order to occur.
Detailed explanation-5: -When oxygen is not present, pyruvate will undergo a process called fermentation. In the process of fermentation the NADH + H+ from glycolysis will be recycled back to NAD+ so that glycolysis can continue. In the process of glycolysis, NAD+ is reduced to form NADH + H+.