What are the components of a nucleotide in DNA?

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The correct choice highlights that a nucleotide, which is the building block of DNA, comprises three fundamental components: a phosphate group, a five-carbon sugar (specifically deoxyribose in the case of DNA), and a nitrogenous base. The phosphate group connects to the sugar, creating a sugar-phosphate backbone that is crucial for the structural integrity of the DNA molecule. The nitrogenous base, which can be adenine, thymine, cytosine, or guanine, is responsible for encoding genetic information and pairs with complementary bases on the opposite DNA strand during the formation of the double helix.

In contrast, the other choices do not accurately represent the components of a DNA nucleotide. For instance, amino acids are not part of DNA nucleotides; they are the building blocks of proteins. Ribose, while a component of RNA nucleotides, is not found in DNA nucleotides, which specifically contain deoxyribose. Additionally, the term 'nucleotide' and 'sugar' in one of the options suggests a misunderstanding of the hierarchical structure, as nucleotides consist of the sugar, phosphate, and nitrogenous base rather than being separate components like the way they are presented. This comprehensive understanding of nucleotide composition

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