Question:
Which one of the following is NOT purely a nitrogenous base?
Which one of the following is NOT purely a nitrogenous base?
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Base + sugar = nucleoside; Base + sugar + phosphate = nucleotide.
Updated On: Mar 6, 2026
- Guanosine
- Adenine
- Cytosine
- Thymine
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The Correct Option is A
Solution and Explanation
Step 1: Understanding nitrogenous bases.
Nitrogenous bases include adenine, guanine, cytosine, thymine, and uracil.
Step 2: Identifying guanosine.
Guanosine is a nucleoside composed of the nitrogenous base guanine and a pentose sugar (ribose).
Step 3: Eliminating other options.
Adenine, cytosine, and thymine are purely nitrogenous bases.
Step 4: Conclusion.
Therefore, guanosine is not purely a nitrogenous base.
Nitrogenous bases include adenine, guanine, cytosine, thymine, and uracil.
Step 2: Identifying guanosine.
Guanosine is a nucleoside composed of the nitrogenous base guanine and a pentose sugar (ribose).
Step 3: Eliminating other options.
Adenine, cytosine, and thymine are purely nitrogenous bases.
Step 4: Conclusion.
Therefore, guanosine is not purely a nitrogenous base.
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