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Question #45936
The Question
Which of the following statements regarding the limitations and energy yield of fermentation is INCORRECT?
Options
- A.
Less than seven percent of the energy in glucose is released during fermentation, and only a fraction of this is trapped as high-energy bonds of ATP.
- B.
In the absence of oxygen as the terminal electron acceptor, the oxidation of NADH to NAD+ is a vigorous process that prevents the inhibition of glycolytic flux.
- C.
Complex multicellular tissues cannot sustain basal metabolic demands solely via fermentation due to the stoichiometric constraint of a net yield of only 2 ATP per glucose molecule.
- D.
Yeasts poison themselves to death when the concentration of alcohol reaches about 13 percent, highlighting the chemical toxicity limitation of anaerobic pathways.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
NADH_Regeneration|Lactate_Dehydrogenase|Cytochrome_Oxidase
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often assume that because fermentation's primary role is to regenerate NAD+ to sustain glycolysis, this regeneration must be highly efficient and 'vigorous'.
However, NCERT explicitly contrasts the 'slow' oxidation of NADH in fermentation with the 'vigorous' oxidation in aerobic respiration, highlighting the critical role of oxygen as a highly electronegative terminal electron acceptor.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Respiration in Plants - Class 11 |
| Concept | Fermentation Limitations |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |