exocytosis The process in which a membrane-enclosed vesicleÞrst fuses with the plasma membrane and then opens and releases its contents to the outside.exonThe DNAbases that code for an amino acid sequence. Exons are separated by intronsthat code for no amino acid sequences exoskeleton A hard, jointed, external covering that encloses the muscles and organs of an organism; typical of many arthropods including insects.exothermic A reaction where the product is at a higher energy level than the reactants.exponential rate An extremely rapid increase, e.g., in the rate of population growth.expression In relation to genes, the phenotypicmanifestation of a trait. Expression may be age-dependent (e.g., Huntington disease) or affected by environmental factors (e.g., dark fur on Siamese cats).
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