Q. Mark the odd one with respect to nucleosides.
NTA AbhyasNTA Abhyas 2020
Solution:
Nucleic acids are polymers of nucleotides. The two types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Nucleotide serves as the building block of nucleic acid.
The nitrogenous base molecule is joined to the sugar molecule by a glycosidic bond and forms a structure called nucleoside. The nucleoside combines with a phosphate group by an ester bond to form a nucleotide.
Nitrogenous Base
Nucleoside Nucleotide Adenine Adenosine Adenylic acid Guanine Guanosine Guanylic acid Thymine Thymidine Thymidylic acid Cytosine Cytidine Cytidylic acid Uracil Uridine Uridylic acid
The base pairing is specific. Adenine is paired with thymine, and guanine is always paired with cytosine. Once the sequence of bases in one strand of a DNA double helix is known, the sequence of bases is known because of the specific base pairing.
| Nitrogenous Base | Nucleoside | Nucleotide |
| Adenine | Adenosine | Adenylic acid |
| Guanine | Guanosine | Guanylic acid |
| Thymine | Thymidine | Thymidylic acid |
| Cytosine | Cytidine | Cytidylic acid |
| Uracil | Uridine | Uridylic acid |