Brownsville is a borough in Fayette County, Pennsylvania, United States, officially founded in 1785 located 35 miles (56 km) south of Pittsburgh along the Monongahela River.
2nd Item Specification: Given a group of organisms and a key, classify organisms based on observable characteristics. Depth of Knowledge Level 1. 1  A tool used by scientists to identify unknown organisms based on observable characteristics is called a. 2  dichotomous key.
The terminal link in the electron transport chain is cytochrome oxidase, an enzyme that mediates the transfer of electrons from the reduced cytochrome c to molecular oxygen. Oxidase positive organisms are detected by the use of oxidase reagent (N,N,N',N'-tetramethyl-p-phenylenediamine dihydrochloride).xidase: The identification of some bacteria is aided by detecting their ability to produce the enzyme cytochrome c oxidase (more commonly referred to simply as oxidase). Pseudomonas aeruginosa, Neisseria gonorrhoeae and Campylobacter jejuni are oxidase-positive pathogens frequently encountered.