covalent bond, reversibly, oxidative phosphorylation, cytochrome c, constitutively, calcium ion, horseradish peroxidase, transiently, molecularly, carbon atom, purkinje cell, enzymatically, neuromuscular junction, plasma membrane, adrenal cortex, chemically, carboxylic acid, sensory neuron, adenosine triphosphate, epithelial cell, electrostatically, cell membrane, homologous chromosomes, valence electron, valence electrons, umbilical vein, arabinose, bile acid, sulfonic acid, helically, xenopus laevis, gamma aminobutyric acid, diffraction grating, covalent, tetrahedral, valent, amide, disulfide, electrovalent, halogen, homopolar, hydrogen, indissoluble, acetylenic, adhesive, adsorbate, associative, chain, closest, cognatic, dissociable, disulphide, ether