the changes in the amino acid sequences of proteins that take place during evolution and speciation, and from which the dates of branchings of taxonomic groups can be deduced.
the rate at which nucleotide (amino acid) substitutions occur in a given DNA (protein) sequence
- Molecular cloud
noun 1. a cool dense interstellar region composed of a wide variety of molecules, mainly hydrogen, plus some dust, in which stars are forming noun a large and dense cloud of cold gas and dust in interstellar space from which new stars are formed Examples It is believed that the creation of newborn stars occurs […]
- Molecular disease
molecular disease n. A disease in which there is an abnormality in or a deficiency of a particular molecule, such as hemoglobin in sickle cell anemia.
noun, Chemistry. 1. a vacuum distillation in which the molecules of the distillate reach the condenser before colliding with one another. noun 1. distillation in which a substance is heated under vacuum, the pressure being so low that no intermolecular collisions can occur before condensation
- Molecular electronics
noun microelectronics; a branch of electronics dealing with microcircuits