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Question #45150
The Question
Early detection of a disease is crucial for successful treatment. A pathogen entering a host exhibits an exponential growth pattern (dN/dt = rN). An ELISA test is employed to detect the pathogen's glycoprotein antigens. Regarding the 'window period'—the time lag between initial infection and the antigen concentration reaching the ELISA's Limit of Detection—which of the following statements is INCORRECT?
Options
- A.
A higher intrinsic rate of natural increase (r) of the pathogen decreases the duration of the window period.
- B.
During this window period, the absolute rate of addition of new pathogens (dN/dt) remains constant until the detection threshold is crossed.
- C.
ELISA provides earlier detection than conventional serum and urine analysis by utilizing highly specific antigen-antibody interactions.
- D.
Even during the window period, the pathogen population is continuously increasing in a J-shaped curve assuming host resources are unlimited.
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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
ELISA|Pathogen detection|Exponential Growth
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often confuse the 'intrinsic rate of natural increase' (r), which is a constant, with the 'absolute growth rate' (dN/dt), which accelerates as the population (N) grows.
The trap assumes that because the pathogen is 'undetectable' (below threshold), its growth rate is static or in a flat lag phase, ignoring the mathematical reality of the J-shaped exponential curve.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biotechnology and Its Applications - Class 12 |
| Concept | Transgenic Animal Purpose |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |