1. What is a biosensor?
a) A device that detects electrical signals
b) A device that detects biological elements
c) A type of microscope
d) A type of computer chip
Answer: b) A device that detects biological elements
2. Which of the following is typically used as a bioreceptor in biosensors?
a) DNA
b) Protein
c) Enzyme
d) All of the above
Answer: d) All of the above
3. The primary function of a biosensor is to:
a) Amplify a biological signal
b) Convert biological information into an electrical signal
c) Detect only chemical pollutants
d) Perform genetic analysis
Answer: b) Convert biological information into an electrical signal
4. What is the most common type of transducer used in biosensors?
a) Optical
b) Thermal
c) Electrochemical
d) Gravitational
Answer: c) Electrochemical
5. Which of the following is an application of biosensors?
a) Environmental monitoring
b) Disease diagnostics
c) Food quality control
d) All of the above
Answer: d) All of the above
6. Which of the following is an example of a biosensor used in glucose detection?
a) Immunosensors
b) Enzyme-based biosensors
c) Optical biosensors
d) Acoustic biosensors
Answer: b) Enzyme-based biosensors
7. What kind of biosensors are typically used in medical diagnostics?
a) DNA biosensors
b) Enzyme-based biosensors
c) Immunosensors
d) Optical biosensors
Answer: c) Immunosensors
8. The biosensor principle that relies on an enzyme to catalyze a reaction is known as:
a) Optical biosensing
b) Electrochemical biosensing
c) Enzyme-based biosensing
d) Acoustic biosensing
Answer: c) Enzyme-based biosensing
9. Which of the following is NOT a typical characteristic of a biosensor?
a) Sensitivity
b) Specificity
c) Cost-efficiency
d) Complexity
Answer: d) Complexity
10. Which of the following is used as a bioreceptor in immunosensors?
a) Antibodies
b) DNA strands
c) Enzymes
d) All of the above
Answer: a) Antibodies
11. Which of the following transducer principles is commonly used in glucose biosensors?
a) Optical
b) Electrochemical
c) Thermal
d) Magnetic
Answer: b) Electrochemical
12. The output signal in a biosensor is typically:
a) Light
b) Heat
c) Electrical
d) Sound
Answer: c) Electrical
13. The use of biosensors in environmental monitoring can help detect:
a) Airborne pollutants
b) Water contaminants
c) Heavy metals
d) All of the above
Answer: d) All of the above
14. Which of the following components is commonly found in a biosensor?
a) Bioreceptor
b) Transducer
c) Detector
d) All of the above
Answer: d) All of the above
15. What does the term “selectivity” in the context of biosensors refer to?
a) The range of temperatures a biosensor can work under
b) The ability of a biosensor to detect a specific analyte
c) The cost-effectiveness of a biosensor
d) The number of components in a biosensor
Answer: b) The ability of a biosensor to detect a specific analyte
16. Which type of biosensor would be most appropriate for detecting pathogens in food products?
a) DNA biosensor
b) Enzyme biosensor
c) Immunosensor
d) Thermal biosensor
Answer: c) Immunosensor
17. Which of the following is an example of a biosensor used for environmental applications?
a) Glucose biosensor
b) Soil pH biosensor
c) Electrochemical biosensor
d) Temperature biosensor
Answer: b) Soil pH biosensor
18. What role do enzymes play in enzyme-based biosensors?
a) They enhance the electrical output
b) They catalyze reactions with the target analyte
c) They act as transducers
d) They increase the sensitivity of the sensor
Answer: b) They catalyze reactions with the target analyte
19. Which of the following is a key challenge in the development of biosensors?
a) High cost
b) Low selectivity
c) Low sensitivity
d) All of the above
Answer: d) All of the above
20. Biosensors are used in the detection of:
a) Glucose levels in diabetic patients
b) Environmental pollution
c) Infectious diseases
d) All of the above
Answer: d) All of the above
21. What is the main advantage of using biosensors over traditional diagnostic methods?
a) Greater cost
b) Faster results
c) More complexity
d) Less accuracy
Answer: b) Faster results
22. Which of the following types of biosensors is useful for detecting DNA or RNA sequences?
a) Optical biosensors
b) Electrochemical biosensors
c) DNA biosensors
d) Enzyme biosensors
Answer: c) DNA biosensors
23. Which of the following could be a limitation of using biosensors in medical diagnostics?
a) High specificity
b) Requires extensive sample preparation
c) May not be portable
d) Lack of availability
Answer: b) Requires extensive sample preparation
24. What is the purpose of a bioreceptor in a biosensor?
a) It converts biological signals into electrical signals
b) It amplifies the electrical signal
c) It binds to a specific analyte
d) It detects electrical noise
Answer: c) It binds to a specific analyte
25. How does a biosensor detect a change in biological activity?
a) By measuring changes in electrical resistance
b) By detecting light intensity
c) By measuring sound waves
d) By observing the physical properties of the sample
Answer: a) By measuring changes in electrical resistance
26. Which of the following types of biosensors is commonly used for medical diagnostics like detecting cholesterol?
a) DNA biosensors
b) Enzyme biosensors
c) Optical biosensors
d) Immunosensors
Answer: b) Enzyme biosensors
27. What is a key feature of immunosensors?
a) They are based on the binding of antibodies to antigens
b) They detect DNA sequences
c) They use enzymes to catalyze reactions
d) They are used exclusively in medical applications
Answer: a) They are based on the binding of antibodies to antigens
28. Which type of biosensor uses a surface plasmon resonance technique to detect biological molecules?
a) Optical biosensor
b) Electrochemical biosensor
c) Immunosensor
d) Acoustic biosensor
Answer: a) Optical biosensor
29. In an enzyme-based biosensor, what happens when the enzyme interacts with the target analyte?
a) It generates an electrical signal
b) It changes the color of the sample
c) It emits sound waves
d) It alters the temperature of the sample
Answer: a) It generates an electrical signal
30. Which of the following is a potential benefit of using biosensors in healthcare?
a) They provide real-time diagnostic results
b) They are difficult to use
c) They require invasive procedures
d) They are not cost-effective
Answer: a) They provide real-time diagnostic results
