Question:easy
Which of the following is a nucleoside?
Which of the following is a nucleoside?
Show Hint
Nucleoside = base + sugar, no phosphate; its name often ends in -idine or -osine.
Updated On: Jun 24, 2026
- Adenine
- Uridine
- Thymine
- Guanine
Show Solution
The Correct Option is B
Solution and Explanation
Step 1: Fix the definitions before choosing. Base alone, base plus sugar is a nucleoside, and base plus sugar plus phosphate is a nucleotide. The names of nucleosides usually end in -idine or -osine.
Step 2: Scan the options for that ending. Uridine ends in -idine and is in fact uracil linked to ribose, a base plus sugar with no phosphate, exactly fitting a nucleoside.
Step 3: The other three (adenine, thymine, guanine) are bare nitrogenous bases. With a sugar attached they would become adenosine, thymidine and guanosine, but as written they are not nucleosides.
\[\boxed{\text{Uridine}}\]
Step 2: Scan the options for that ending. Uridine ends in -idine and is in fact uracil linked to ribose, a base plus sugar with no phosphate, exactly fitting a nucleoside.
Step 3: The other three (adenine, thymine, guanine) are bare nitrogenous bases. With a sugar attached they would become adenosine, thymidine and guanosine, but as written they are not nucleosides.
\[\boxed{\text{Uridine}}\]
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