Multiple Choice
In the context of nucleic acids, ATP (adenosine triphosphate) is best classified as which type of macromolecule building block?
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1. Introduction to Biochemistry
Nucleic Acids
Multiple Choice
In the context of nucleic acids, which statement best describes ATP (adenosine triphosphate)?
A
ATP is a macromolecule because it is a long polymer of repeating nucleotides.
B
ATP is a nucleotide (a small molecule) composed of adenine, ribose, and three phosphate groups; it is not a macromolecule.
C
ATP is a macromolecule because it is a phospholipid with a hydrophobic tail and a phosphate head group.
D
ATP is a macromolecule because it is a protein enzyme that catalyzes phosphorylation reactions.
Verified step by step guidance1
Step 1: Understand the definition of a nucleotide and a macromolecule. A nucleotide is a small molecule consisting of a nitrogenous base, a sugar (ribose or deoxyribose), and one or more phosphate groups. Macromolecules are large polymers made up of repeating subunits, such as nucleic acids, proteins, or polysaccharides.
Step 2: Analyze the structure of ATP (adenosine triphosphate). ATP consists of the nitrogenous base adenine, the sugar ribose, and three phosphate groups linked together. This makes ATP a single nucleotide with three phosphate groups attached.
Step 3: Compare ATP to nucleic acids. Nucleic acids like DNA and RNA are polymers made of many nucleotides linked together. ATP, however, is a single nucleotide and not a polymer, so it is not a macromolecule.
Step 4: Evaluate the other options. ATP is not a phospholipid (which has a hydrophobic tail and phosphate head), nor is it a protein enzyme. These descriptions do not fit ATP's chemical nature.
Step 5: Conclude that ATP is best described as a nucleotide (a small molecule) composed of adenine, ribose, and three phosphate groups, and it is not a macromolecule.
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