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Question #47635
The Question
Consider the following statements regarding anaerobic respiration (alcoholic fermentation) in yeast. Which of the following statements is INCORRECT?
Options
- A.
It releases less than seven percent of the energy stored in glucose, and not all of it is trapped as high-energy bonds of ATP.
- B.
Accumulation of ethanol beyond 13% causes self-poisoning by disrupting membrane fluidity and acting as a negative feedback inhibitor on the zymase complex.
- C.
The oxidation of NADH + H⁺ to NAD⁺ occurs vigorously to maintain a continuous supply of ATP via substrate-level phosphorylation.
- D.
To obtain alcoholic beverages with a concentration significantly higher than 13%, distillation of the naturally fermented broth is required.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Yeast|Zymase|NAD+_Regeneration|Feedback_Inhibition
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Confusing the overall utility of fermentation (quick ATP during hypoxia) with the specific kinetic rate of NADH oxidation.
Students often assume that because fermentation is a rapid emergency response, NADH oxidation must be 'vigorous'.
NCERT explicitly contrasts the 'slow' oxidation in fermentation with the 'vigorous' oxidation in aerobic respiration.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Photosynthesis in Higher Plants - Class 11 |
| Concept | Law of Limiting Factors |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |