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Phosphate of a nucleotide is attached to...

Phosphate of a nucleotide is attached to carbon atom of its pentose sugar

A

1'

B

2'

C

3'

D

5'

Text Solution

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The correct Answer is:
To determine which carbon atom of the pentose sugar a phosphate group of a nucleotide is attached to, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Nucleotide Structure**: A nucleotide is composed of three main components: a nitrogenous base, a pentose sugar, and a phosphate group. 2. **Identifying the Pentose Sugar**: The pentose sugar can either be ribose (in RNA) or deoxyribose (in DNA). For this explanation, we will consider ribose as the example. 3. **Drawing the Structure of Ribose**: The structure of ribose can be represented as a five-carbon sugar. The carbon atoms are labeled as follows: - 1' (C1) - 2' (C2) - 3' (C3) - 4' (C4) - 5' (C5) 4. **Locating the Phosphate Group Attachment**: In a nucleotide, the phosphate group is attached to the 5' carbon of the pentose sugar. This is a key feature of nucleotide structure. 5. **Identifying the Nitrogenous Base Attachment**: The nitrogenous base is attached to the 1' carbon of the pentose sugar. 6. **Conclusion**: Therefore, the phosphate group of a nucleotide is attached to the 5' carbon atom of its pentose sugar. ### Final Answer: The phosphate of a nucleotide is attached to the **5' carbon atom** of its pentose sugar. ---
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