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प्रश्न
Which radioactive isotope was used to label the protein coat in Set B of the Hershey-Chase experiment?
पर्याय
⁷Be (Beryllium-7)
³⁵S (Sulphur-35)
³²P (Phosphorus-32)
¹⁴C (Carbon-14)
MCQ
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उत्तर
³⁵S (Sulphur-35) was used to label the protein coat because sulphur is found in amino acids (cysteine and methionine) and is absent from DNA. Bacteriophages grown in medium containing ³⁵S incorporated the isotope into their protein coats, creating radioactively labeled protein phages.
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