The sugar unit in DNA molecule is:
Correct answer: B. 2 - deoxyribose
- A. Ribose
- B. 2 - deoxyribose
- C. 3 - deoxyribose
- D. 2 - deoxypentose
Explanation
The sugar unit in a DNA molecule is deoxyribose. Deoxyribose is a five-carbon sugar that forms the backbone of the DNA molecule along with phosphate groups. It is called "deoxyribose" because it lacks one oxygen atom compared to the ribose sugar found in RNA. The arrangement of deoxyribose and phosphate groups forms the alternating sugar-phosphate backbone of the DNA double helix, while the nitrogenous bases (adenine, thymine, cytosine, and guanine) are attached to the deoxyribose sugar. This is a factual recall question. DNA is a polymer of deoxyribonucleotides. The sugar is a pentose sugar called 2-deoxyribose, which differs from pentose ribose sugar by lacking an oxygen atom on carbon no. 2.
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