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organic molecules

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The smallest units of organic compounds. Important examples of these molecules are based on chains of carbon atoms and come in four major categories: proteins, carbohydrates, lipids, and nucleic acids (DNA and RNA).

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Shoelaces, rainbow, toothpaste, and haircuts are all what type of noun?

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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