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What is the backbone of DNA composed of?
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4. Biomolecules
Nucleic Acids
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Which of the following descriptions best fits the class of molecules known as nucleotides?
A
A nitrogenous base & a phosphate group.
B
A nitrogenous base & a sugar.
C
A nitrogenous base, phosphate group & a sugar.
D
A nitrogenous base, a carbohydrate, & a sugar.
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Understand the structure of a nucleotide: Nucleotides are the building blocks of nucleic acids like DNA and RNA. They consist of three components: a nitrogenous base, a phosphate group, and a sugar.
Identify the nitrogenous base: This is one of the key components of a nucleotide. Common nitrogenous bases include adenine, thymine, cytosine, guanine, and uracil.
Recognize the sugar component: In nucleotides, the sugar is typically a pentose sugar, which can be either ribose (in RNA) or deoxyribose (in DNA).
Include the phosphate group: The phosphate group is crucial for forming the backbone of the nucleic acid structure, linking the sugars of adjacent nucleotides.
Combine all components: A nucleotide is correctly described as having a nitrogenous base, a phosphate group, and a sugar. This combination is essential for the formation of nucleic acids.
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