
Concept explainers
Which of the following is/are not essential to carry out the polymerase chain reaction?
- a. primers
- b. DNA polymerase
- c. gel electrophoresis
- d. high temperature

Introduction:
PCR is a technique used to replicate and produce several copies of DNA. PCR has a wide application in research, medicine, agriculture, and many other fields.
Answer to Problem 1MCQ
Correct answer:
Gel electrophoresis is not essential to carry out polymerase chain reaction. Therefore, option (c) is correct.
Option (c) is given as “gel electrophoresis”.
Explanation of Solution
Justify reason for the correct statement:
PCR is a technique used to amplify DNA molecules. This technique involves three steps: denaturation, annealing, and extension. In denaturation, double stranded DNA is heated athigh temperature
After polymerase chain reaction, the resulted fragments are run into gel electrophoresis. Gel electrophoresis is used to separate DNA fragments according to the molecular weight. Thus, gel electrophoresis is not essential to carry out PCR.
Hence, option (c) is correct.
Justify reasons for the incorrect statements:
Option (a) is given as “primers”.
Primers are essential to carry out the polymerase chain reaction. Hence, it is a wrong answer.
Option (b) is given as “DNA polymerase”.
DNA polymerase is important to synthesize DNA fragment. Hence, it is a wrong answer.
Option (d) is given as “high temperature”.
High temperature is required for denaturation of DNA. Hence, it is a wrong answer.
Hence, options (a),(b), and(d) are incorrect.
Gel electrophoresis technique is used after the PCR reaction. Gel electrophoresis technique is used to separate the amplified DNA fragments.
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