8. Analyzing Concepts Humans are about 65 percent water, and tomatoes are about 90 percent water. Yet, water is not a major building block of life. Explain.
9. Analyzing Concepts Carbon dioxide, CO2, contains carbon, yet it is considered to be inorganic. Explain.
10. Relating Information Condensation reactions are also referred to as dehydration synthesis. Explain how the name dehydration synthesis is descriptive of the process.
Four main classes of organic compounds are essential to the life processes of all living things: carbohydrates, lipids, proteins, and nucleic acids. You will see that although these compounds are built primarily from carbon, hydrogen, and oxygen, these atoms occur in different ratios in each class of compound. Each class of compounds has different properties.
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