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Set of Nuleosides are
Adenine and Uridine
Guanosine and Cytosine
Thymidine and Uridine
2 and 3 both
Answers (1)
Nucleosides are molecules composed of a nitrogenous base (purine or pyrimidine) bonded to a sugar molecule (ribose or deoxyribose) through a glycosidic bond. The two main types of nucleosides are ribonucleosides, where the sugar is ribose, and deoxyribonucleosides, where the sugar is deoxyribose. Nucleosides are fundamental building blocks of nucleic acids, such as DNA and RNA.
Option 3 which contains the options Thymindine and Uridine is correct because,
- Thymidine is a nucleoside that consists of the pyrimidine base Thymine bonded to a deoxyribose sugar. Thymine is one of the four nitrogenous bases found in DNA (along with Adenine, Guanine and Cytosine). The deoxyribose sugar is a modified form of a ribose sugar, lacking an oxygen atom at the 2' carbon position. Thymidine plays a crucial role in DNA replication and DNA synthesis.
- Uridine, on the other hand, is a nucleoside that consists of the pyrimidine base Uracil bonded to a ribose sugar. Uracil is a nitrogenous base found in RNA (along with Adenine, Guanine and Cytosine). Ribose sugar is a five-carbon sugar molecule that forms the backbone of RNA. Uridine is involved in various processes in RNA metabolism, including RNA synthesis and regulation.
The explanation for incorrect options,
Option 1 is incorrect because they do not form a valid set of nucleosides, as Adenine is a purine base, while Uridine is a pyrimidine base.
Similarly, option 2 is incorrect because they also do not form a valid set, as Guanosine is a nucleoside composed of the purine base Guanine, whereas Cytosine is a free pyrimidine base.
Hence, option 3 is the correct answer
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