Biological Molecules What are the building blocks of life? Why? From the smallest single-celled organism to the tallest tree, all life depends on the properties and reactions of four classes of organic (carbon-based) compounds—carbohydrates, lipids, proteins, and nucleic acids. These organic molecules are the building blocks of all living things, and are responsible for most of the structure and functions of the body, including energy storage, insulation, growth, repair, communica- tion, and transfer of hereditary information. Simple organic molecules can be joined together to form all the essential biological molecules needed for life. Model 1 – Molecules of Life 1. Use Model 1 to show which atoms are present in each type of molecule by listing the symbol for each atom included. Carbohydrate has been done for you. a. Carbohydrate— C, H, O b. Amino acid— _H, C,O,N _ c. Lipid— _C,H,O_ d. Nucleic acid— _N,H,O,C,P_ 2.Which type of molecule includes an example with a long-chain carbon backbone? _Lipids have a long-chain carbon backbone _ 3.In the molecule referred to in the previous question, what is the dominant element attached to the carbon backbone? _Hydregon is the dominant element attached to the carbon backbone. _ 4. The fatty acid chain of the lipids is often referred to as a hydrocarbon chain. Discuss with your group why the chain is given this name and write a one-sentence definition for a hydrocarbon. _It’s made up of Hydrogen and Carbon _
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- Fall '19