The reaction which is used to radioactively label DNA is the synthesis of new DNA. Thus, the correct option is B.
What is radioactively labeled DNA?
Radioactively labeled DNA may be defined as those sequences of nucleotides that are labeled with radioisotopes for the detection of specific nucleic acid sequences within the DNA.
Such radioactive labeled DNA is typically incorporated via the activity of certain enzymes into the DNA or RNA sequences, particularly for detection and analysis.
Ligation of DNA is carried out by the enzyme DNA ligase. Restriction of DNA is carried out by the enzyme restriction endonucleases. Degradation of DNA is carried out by physical factors like exposure to UV radiation, high temperature, salt concentration, etc.
Therefore, the reaction which is used to radioactively label DNA is the synthesis of new DNA. Thus, the correct option is B.
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