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ï§Carbon-based molecules are called organic compounds. ï§â¯By sharing electrons, carbon can ââ¯bond to four other atoms and ââ¯branch in up to four directions. ï§â¯compounds composed of only carbon and hydrogen are called hydrocarbons. ï§â¯A carbon skeleton is a chain of carbon atoms that can be ââ¯branched or ââ¯unbranched.
The major classes of biological molecules that are important for all. living things are carbohydrates, lipids, proteins, and nucleic. acids. Large biological molecules are called macromolecules. 6. Macromolecules are built by combining smaller. building blocks into polymers. Polysaccharides (large carbohydrates) are polymers of. monosaccharides. Fats are built from fatty acids and glycerol.