Statement A: Glycosidic bonds are seen in nucleic acids.
Statement B: In a nucleic acid one nucleotide is joined to another nucleotide of the same strand by the formation of glycosidic bonds.
 

In a nucleic acid N-glycosidic bonds are formed between the first carbon of pentose sugar and 1st position of pyrimidine or 9th position of purine. One nucleotide is joined to another nucleotide of the same strand by the formation of phosphodiester bond.