A) \[{{C}^{14}}\]
B) \[{{O}^{18}}\]
C) \[{{N}^{15}}\]
D) \[{{S}^{35}}\]
Correct Answer: D
Solution :
Proteins are large-sized molecules having one or more polypeptides. Newly synthesized protein is detected by using radioisotope of sulphur \[({{S}^{35}})\]. Radioisotope of carbon \[({{C}^{14}})\] used to prove the \[C{{O}_{2}}\] reduction in dark reaction of photosynthesis. Heavy isotope of oxygen \[({{O}^{18}})\] is used to determine that oxygen in photosynthesis released as a product of photolysis of water. Meselson and Stahl (1958) varified the semi-conservative nature of DNA-replication by using heavy isotope of nitrogen \[({{N}^{15}})\].
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