A) phosphate only
B) phosphate and sugar only
C) phosphate, sugar and nitrogen base
D) phosphate and nitrogen base only
Correct Answer: C
Solution :
A sugar molecule and a nitrogenous base form a nucleoside, and a nucleoside plus a phosphate group form a nucleotide. The nucleotides of RNA are called ribonucleotides, and those of DNA deoxyribonucleotides. Ribonucleotides contain the sugar ribose and dexyribonucleotides the sugar deoxyribose.
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