Out of the following choices;
a) tail b) DNA c) base plate d) protein coat e) head.
The answer is B. Phosphorus-32 is a radioactive isotope of phosphorus. It is used to label the DNA of the phage because phosphorus is an important element in the structure of DNA and the radioactive phosphorus can be tracked, unlike the naturally-occurring phosphorus. Phosphate groups are critical in the formation of 3’ to 5’ sugar-phosphate backbone bonds between adjacent nucleotides to form DNA.
