Answer:
(a)
Difference between Nucleotide and Nucleoside
(b) The two strands of the DNA molecules are said to
be complementary to each other in the sense that the sequence of bases in one
strand automatically controls that of the other. This specific base pairing is
the most important principle of the structure of DNA. 1
When the phosphate
group is attached to the nuceloside, the compound formed is called
nucleotide.
The molecules in
which one of the nitrogen base (Purine or pyrimidine) is bounded with a sugar
molecule is called nucleoside.
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