A) purine, sugar and phosphate
B) purine, pyrimidine and phosphate
C) purine, pyrimidine, sugar and phosphate
D) pyrimidine, sugar and phosphate
Correct Answer: C
Solution :
The nucleotide is formed by the union of a phosphate group with a nucleoside. A nucleoside infact contains a sugar molecule along with an organic nitrogenous base. Thus, a nucleotide contains an organic nitrogenous base (purine or pyrimidine) along with a sugar molecule and a phosphate group, ie, Nucleoside = Sugar molecule + organic nitrogenous base Nucleotide = Nucleoside + phosphate group.
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