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Q:
A) a nitrogenous base, deoxyribose sugar and phosphate group | B) a nitrogenous base, ribose sugar and phosphate group |
C) deoxyribose sugar, ribose sugar and phosphate group | D) a nitrogenous base and phosphate group only |
Answer: A) a nitrogenous base, deoxyribose sugar and phosphate group
Explanation:
Explanation:
The two DNA strands are called polynucleotidesbecause they are composed of simpler monomer units called nucleotides. Eachnucleotideis composed of one of four nitrogen-containingnucleobases (cytosine, guanine, adenine or thymine), a sugar called deoxyribose, and a phosphate group.