alleryEach nucleotide of a DNA molecule is made up of three components. Which set correctly lists all three?
ADeoxyribose sugar, base, phosphate
BRibose sugar, base, phosphate
CDeoxyribose sugar, base, protein
DGlucose sugar, base, phosphate
Answer & Solution
Correct answer: A. Deoxyribose sugar, base, phosphate
1. A DNA nucleotide has three parts: a sugar, a nitrogenous base and a phosphate group.
2. The sugar in DNA is deoxyribose, not ribose, which rules out option B.
3. There is no protein within a single nucleotide, which rules out option C.
4. So the correct set is deoxyribose sugar, base and phosphate, option A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Structure of DNA", p.274_
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