Protein Structure: Introduction Protein: Pictorial representations we are familiar with are schematic models, simplified representations. Model we know of real molecules: Quantum mechanical, probabilistic collections of atoms as both particles and waves. Atoms: Hydrogen: H Carbon: C
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A commonly-used example of a polar compound is water (H2O). The electrons of water's hydrogen atoms are strongly attracted to the oxygen atom, and are actually closer to oxygen's nucleus than to the hydrogen nuclei; thus, water has a relatively strong negative charge in the middle (red shade), and a positive charge at the ends (blue shade).