Question

Identify the carbon atom numbered from $C_{1}^{\prime}$ to $C_{5}^{\prime}$ of monosaccharide unit of DNA nucleotide that lacks oxygen from -OH group.

• A. $C_{1}^{\prime}$
• B. $C_{2}^{\prime}$
• C. $C_{3}^{\prime}$
• D. $C_{4}^{\prime}$

Hint:

DNA = 2'-deoxyribose; RNA = ribose.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question refers to the structure of deoxyribose sugar in DNA.

Step 3: Detailed Explanation:
In RNA, the sugar is Ribose, which has hydroxyl (\( \text{-OH} \)) groups on both \( \text{C}'_2 \) and \( \text{C}'_3 \).
In DNA, the sugar is 2-deoxyribose.
The prefix "2-deoxy" indicates that the oxygen atom is missing from the hydroxyl group at the 2nd carbon (\( \text{C}'_2 \)) position.

Step 4: Final Answer:
The carbon atom that lacks oxygen is \( \text{C}'_2 \).