Which of the following is NOT a type of macromolecule?

Prepare for the IB Biology Exam. Study with multiple choice questions and detailed explanations. Master key concepts and excel in your test!

Vitamins are not classified as macromolecules. Macromolecules typically refer to large, complex molecules that are essential for biological functions and include carbohydrates, proteins, and nucleic acids. These macromolecules are made up of smaller subunits: carbohydrates are composed of monosaccharides, proteins are made from amino acids, and nucleic acids consist of nucleotides.

Vitamins, in contrast, are organic compounds that are required in smaller amounts to support various biochemical functions. They play vital roles in metabolic processes, but they do not fall into the category of macromolecules as they do not have a polymeric structure or large molecular size like the others mentioned. This distinction is what makes the answer regarding vitamins as not being a type of macromolecule accurate.

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