Question:
What is the total number of carbon atoms present in a sugar molecule of RNA nucleotide?
What is the total number of carbon atoms present in a sugar molecule of RNA nucleotide?
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Both RNA and DNA backbones utilize 5-carbon (pentose) sugars. DNA contains deoxyribose (lacking an oxygen at the 2' position), while RNA contains standard ribose.
Updated On: Aug 19, 2026
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
The question is asking for the carbon atom count in the specific carbohydrate ring found within the structure of an RNA molecule.
Step 2: Detailed Explanation:
Nucleotides are the building blocks of nucleic acids (RNA and DNA). They consist of three components: a nitrogenous base, a phosphate group, and a pentose sugar.
The prefix "pentose" specifically dictates that the sugar molecule contains exactly 5 carbon atoms.
In Ribonucleic Acid (RNA), the specific pentose sugar is $\beta$-D-ribose ($C_5H_{10}O_5$).
Step 3: Final Answer:
Since ribose is a pentose sugar, it has 5 carbon atoms. Option (b) is the correct answer.
The question is asking for the carbon atom count in the specific carbohydrate ring found within the structure of an RNA molecule.
Step 2: Detailed Explanation:
Nucleotides are the building blocks of nucleic acids (RNA and DNA). They consist of three components: a nitrogenous base, a phosphate group, and a pentose sugar.
The prefix "pentose" specifically dictates that the sugar molecule contains exactly 5 carbon atoms.
In Ribonucleic Acid (RNA), the specific pentose sugar is $\beta$-D-ribose ($C_5H_{10}O_5$).
Step 3: Final Answer:
Since ribose is a pentose sugar, it has 5 carbon atoms. Option (b) is the correct answer.
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