A hydrogen bond is the electromagnetic attraction between polar molecules in which hydrogen is bound to a larger atom, such as oxygen or nitrogen. This is not a sharing of electrons, as in a covalent bond. Instead, this is an attraction between the positive and negative poles of charged atoms.
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When the body perspires, it cools itself due to the high specific heat capacity of water. Perspiration produces a cooling effect.
DNA helicase - unzips the DNA double helix
DNA Polymerase - edits genes to ensure there are no errors, a 'proofreading system'.
DNA ligase - joins all the DNA together
