Multiple Choice
ATP (adenosine triphosphate) is best classified as which type of biomolecule?
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1. Introduction to Biochemistry
Nucleic Acids
Multiple Choice
In the context of nucleic acids, ATP (adenosine triphosphate) is best classified as which type of macromolecule or related biomolecule?
A
A nucleotide (a nucleoside triphosphate)
B
A triglyceride
C
A polysaccharide
D
A polypeptide
Verified step by step guidance1
Recall the four major classes of biological macromolecules: carbohydrates (polysaccharides), lipids (such as triglycerides), proteins (polypeptides), and nucleic acids (nucleotides and nucleosides).
Understand that ATP (adenosine triphosphate) consists of an adenine base, a ribose sugar, and three phosphate groups, which matches the structure of a nucleotide with phosphate groups attached.
Recognize that a nucleotide is composed of three parts: a nitrogenous base, a five-carbon sugar, and one or more phosphate groups. ATP fits this definition as it is a nucleoside (adenine + ribose) with three phosphate groups attached.
Eliminate other options: triglycerides are lipids made of glycerol and fatty acids, polysaccharides are long chains of sugars, and polypeptides are chains of amino acids. ATP does not fit these categories.
Conclude that ATP is best classified as a nucleotide, specifically a nucleoside triphosphate, which is a building block of nucleic acids and also serves as an energy carrier in cells.
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