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Unformatted text preview: ween large molecules – H‐bonds are weaker than covalent or ionic bonds, but collectively they are very strong. – Weakness of H‐bond makes them easier to break (particularly by elevated temperatures) – Many opportunities for H‐bonding in large biomolecules attraction Electrical attraction • van der Waals forces: weak attractive forces (weaker than H‐bonds)
– Such forces develop between nonpolar molecules or regions – Occur by chance accumulation of electrons in one part of a molecule; leads to zones of positive & negative charge creating polarity. – If oriented properly (i.e., positive zone near negative zone), molecules can briefly attract one another. Electrical attraction between nonpolar molecules by van der Waals forces H2 H2 CH4 CH4 Summary of Chemical Bonds & Interactions Big picture: the arrangement of atoms and their types of bonding dictates the structure and function of biological molecules. *Emergent properties Molecular shape is crucial for recognition & binding between molecules
• The configuration of atoms in a molecule are arranged based on the bond angles between t...
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- Spring '10