In which component of the biosensor does a whole bacterial cell work?

Correct option is C

Explanation:
A biosensor is an analytical device that combines a biological component with a physicochemical detector. It typically has three components:
1. Recognition Element:
· This is where the biological sensing occurs.
· It includes enzymes, antibodies, DNA, or whole bacterial cells, which interact specifically with the target analyte.
2. Transducer Element:
· Converts the biological interaction into a measurable signal (optical, electrical, etc.).
3. Signal Processor/Display:
· Converts the transducer signal into a readable output.
A whole bacterial cell is used as a biological recognition system because it can detect, metabolize, or bind to specific analytes, especially in environmental monitoring, toxicology, or bioremediation biosensors.
Information Booster:
· Microbial biosensors are biosensors where living microbes act as biorecognition elements.
· These are effective in detecting biodegradable pollutants, toxic metals, and pesticides.
Additional Information:
· (a) Electrical interface: Refers to signal connectivity and not biological function.
· (b) Transducer: Only converts signal; doesn't contain the cell.
· (d) Display unit: Shows the result but plays no role in sensing or recognition.