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Multiple Choice
Which of the following is not considered a macromolecule?
A
Carbohydrate
B
Nucleic Acid
C
Protein
D
Water
Verified step by step guidance
1
Understand the definition of macromolecules: Macromolecules are large, complex molecules that are typically composed of thousands of atoms. They are essential for life and include carbohydrates, nucleic acids, proteins, and lipids.
Identify the options given in the problem: Carbohydrate, Nucleic Acid, Protein, and Water.
Recognize that carbohydrates, nucleic acids, and proteins are all examples of macromolecules. They are polymers made up of smaller units called monomers. For example, carbohydrates are made of sugar monomers, nucleic acids are made of nucleotide monomers, and proteins are made of amino acid monomers.
Consider the properties of water: Water is a small molecule composed of two hydrogen atoms and one oxygen atom (H₂O). It is not a polymer and does not consist of repeating units, which distinguishes it from macromolecules.
Conclude that water is not considered a macromolecule because it does not fit the criteria of being a large, complex molecule composed of repeating units or monomers.