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Question #45239
The Question
A mesophilic cell is subjected to a gradual heat shock thermal gradient. Initially, cellular metabolism is maintained, but as the temperature exceeds a critical threshold, a sudden and irreversible metabolic crisis occurs despite the maximum expression of Heat Shock Proteins (HSPs). Which of the following best explains the primary molecular basis of this metabolic collapse?
Options
- A.
Cleavage of covalent peptide bonds within the primary structure of thermolabile enzymes due to extreme kinetic energy.
- B.
Irreversible disruption of hydrogen bonds and hydrophobic interactions, overwhelming the chaperone-mediated refolding mechanism.
- C.
Denaturation of the genomic DNA double helix, which immediately arrests the transcription of all metabolic enzymes.
- D.
Allosteric inhibition of thermolabile enzymes by Heat Shock Proteins to temporarily suspend metabolism during thermal stress.
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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
Chaperonins|Protein_Denaturation_Specificity|Heat_Shock_Thermal_Gradient
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Differentiating between the bonds broken during denaturation (non-covalent vs. covalent).
A common misconception is that extreme heat destroys the primary structure (peptide bonds) of proteins.
The question also tests the NCERT-Plus application of how molecular chaperones (HSPs) function to protect tertiary structure and what happens when their functional capacity is exceeded.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biomolecules - Class 11 |
| Concept | Protein Denaturation Specificity |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |