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Questions and Answers
What are the components of a nucleotide in DNA?
What are the components of a nucleotide in DNA?
- Phosphate group, ribose sugar, uracil base
- Phosphate group, deoxyribose sugar, nitrogenous base (correct)
- Phosphate group, ribose sugar, nitrogenous base
- Phosphate group, deoxyribose sugar, adenine base
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Study Notes
Nucleotide Components in DNA
- A nucleotide is composed of three main components: a sugar molecule, a phosphate group, and a nitrogenous base.
- The sugar molecule is deoxyribose, a five-carbon sugar that provides the backbone of the DNA molecule.
- The phosphate group is a phosphate ion bonded to the 5-carbon sugar, forming a phosphodiester bond.
- The nitrogenous base is one of four possible bases: adenine (A), guanine (G), cytosine (C), and thymine (T).
- Adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C), forming the rungs of the DNA double helix.
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