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The four levels of protein structure are primary, secondary, tertiary, and quaternary. It is helpful to understand the nature and function of each level of protein structure in order to fully understand how a protein works.
The structure of DNA double helix and how it was discovered. Chargaff, Watson and Crick, and Wilkins and Franklin.
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Explanation of the structure and function of globular proteins.
9 years ago. The O does act as a nucleophile in competition with N, but it's a dead-end process. Reaction with O gives the reversible formation of a hemiketal. Reaction with N forms the oxime in an essentially irreversible process as the adduct dehydrates.
Hydrogen bonding is a special type of dipole-dipole interaction that occurs between the lone pair of a highly electronegative atom (typically N, O, or F) and the hydrogen atom in a N–H, O–H, or F–H bond. Hydrogen bonds can form between different molecules (intermolecular hydrogen bonding) or between different parts of the same molecule (intramolecular hydrogen bonding).
A major factor is that the protein begins folding into secondary structure elements as it is made. These then can assemble into tertiary structural elements called domains (more or less independent substructures).
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