Before You Begin
Question #46986
The Question
During the commercial production of a fungal secondary metabolite in a sparged stirred-tank bioreactor, a failure in the cooling jacket leads to a moderate temperature spike and pH fluctuation. Subsequently, the product titer drops catastrophically, and microscopic analysis of the biomass reveals the emergence of dikaryotic hyphae and early fruiting bodies. Which of the following best explains the physiological basis for the sudden drop in product yield?
Options
- A.
The environmental stress triggered the sexual lifecycle, redirecting the carbon flux from secondary metabolism toward sporocarp development.
- B.
The temperature spike accelerated the exponential phase, causing the fungus to prioritize primary vegetative growth over idiophase metabolism.
- C.
The pH fluctuation inhibited asexual conidiophore formation, forcing the fungus to catabolize its secondary metabolites for survival.
- D.
The altered physicochemical conditions induced severe shear stress, leading to mycelial fragmentation and the leakage of intracellular products.
Check Your Answer
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
Pathogenic_Fungi|Sexual_Recombination|Darwinian_Fitness
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Integrating Class 11 Fungal Reproduction with Class 12 Biotechnology.
Students often default to 'enzyme denaturation' or 'cell death' when bioreactor conditions fail.
The trap is failing to recognize that fungi actively respond to environmental stress by shifting their entire developmental and metabolic program toward sexual reproduction (fruiting bodies), which acts as a massive metabolic sink.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biological Classification - Class 11 |
| Concept | Fungal Sexual Lifecycle Stages |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |