Q.Which of the following one is used as a Biosensors?
a. Electrophoresis
b. Bioreactors
c. Vectors
d. Electroporation

Step 1. Recall the definition of a biosensor. A biosensor is an analytical device that combines a biological sensing element (an enzyme, antibody, or whole cell) with a physicochemical transducer to detect and report a chemical or biochemical signal.

Step 2. Recall where biosensors are actually used in biotechnology practice. This chapter's own text notes that materials such as GFP are 'used to make biosensors,' and in standard practice biosensors are fitted into a running bioreactor/fermenter to allow online (in-line, real-time) monitoring of process conditions — pH, temperature, dissolved oxygen, and substrate or product concentration — without repeatedly withdrawing samples for offline testing. …

Match the definition of a biosensor (biological component + transducer used for detection/monitoring) against the actual technical function of each option, …

• Confusing electrophoresis (a separation technique) with a sensing or detection device
• Assuming a vector itself 'senses' the presence of the recombinant gene, when screening methods (e.g. blue-white selection) actually do tha …