A strain that differs in metabolic capabilities is known as what?

The term that refers to a strain of an organism that exhibits differences in metabolic capabilities is known as a biovar. Biovars are classified based on biochemical or physiological traits, such as the ability to ferment certain sugars or produce particular enzymes. This classification is essential for understanding the diversity within a species and how different strains may interact with their environment, including their potential effects on host organisms or their role in diseases.

Subspecies, while also used to denote variations within a species, typically refers to strains that are more genetically distinct rather than based purely on metabolic capabilities. Serotypes are classifications based on serological differences and the unique antigens present on the surface of pathogens. Pathotypes, on the other hand, denote strains that differ in their ability to cause disease, which may not directly relate to their metabolic functions. Thus, biovar is the most appropriate term for strains distinguished by their metabolic characteristics.