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Multiple Choice
In the context of nucleic acids and cellular energy transfer, which type of biomolecule is ATP?
A
A polysaccharide (carbohydrate polymer)
B
A triacylglycerol (lipid)
C
A nucleotide (a nucleoside triphosphate)
D
A polypeptide (protein)
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Verified step by step guidance
1
Understand the structure of ATP (adenosine triphosphate): ATP consists of a nitrogenous base (adenine), a sugar (ribose), and three phosphate groups attached in a chain.
Recall the classification of biomolecules: carbohydrates are sugars or polymers of sugars, lipids include fats and oils, proteins are made of amino acids, and nucleotides are the building blocks of nucleic acids.
Recognize that ATP contains a nitrogenous base and a sugar, which together form a nucleoside, and the addition of phosphate groups makes it a nucleotide triphosphate.
Identify that ATP functions as a primary energy carrier in cells, which is characteristic of nucleotides involved in energy transfer rather than carbohydrates, lipids, or proteins.
Conclude that ATP is classified as a nucleotide (specifically a nucleoside triphosphate) based on its chemical structure and biological role.