BIO 101 Lecture Notes - Lecture 3: Protein Structure, Cell Nucleus, Peptide
7 Nov 2016
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3 & 4 protein structure & function of nucleic acids. Large molecules made up of any smaller molecules. Proteins are versatile macromolecules that serve as building block. Protein diversity: proteins perform a variety of different functions. They all, however, are built the same way and from the same raw materials in organisms. Contractile: allow muscles to contract, heart to pump, and sperm to swim. Transport: carry molecules such as oxygen around your body. 8 of the 20 aa are essensial aa and cannot be made by the body so must be consumed in diet. Complete proteins contain all 8 essential aa, while incomplete proteins do not. Primary structure: sequence of aa in a polypeptide, similar to sequence of letters that spell out a specific word. Secondary structure: corkscrew-like twists or pleated folds formed by hydrogen bonds between aa in polypeptide chain.
