Correct choice is (b) False
To explain: Freshness of meat or fish is measured by using ATPase, amino oxidase and putrescine oxidase. These sensors measure nitrate by color change in pH indicator which is detected by transducer. Penicillinase enzyme is used to measure penicillin concentration. These sensors consist of a silicon wafer pH sensitive layer on which penicillinase enzyme is immobilized. Hence the above statement is false.