Correct option (c) Thymidine
Explanation :
DNA consists of deoxyribose sugar, phosphate molecules and nitrogenous bases-adenine, guanine, cytosine and thymine, where as RNA consists of ribose sugar, phosphate molecules and nitrogenous bases-adenine, guanine, cytosine and uracil.
Thus, estimating the incorporation of radiolabelled thymine can measure DNA synthesis and radiolabelled uracil can measure RNA synthesis, as all other nitrogenous bases are similar in both DNA and RNA.
