What is the definition of a dominant trait in biology? What is the difference between biology and AP biology? What is the difference between molecular biology and cell biology?
DNA gyrase, often referred to simply as gyrase, is an enzyme that relieves strain while double-strand DNA is being unwound by helicase. It is also known as DNA topoisomerase II. This causes negative supercoiling of the DNA. Bacterial DNA gyrase is the target of many antibiotics, including nalidixic acid, novobiocin, and ciprofloxacin.
High power microscopy (~400X) allows the resolution of individual bacterium which typically reveals cocci or bacilli contamination in the cell culture environment. Bacterial contamination is sometimes confused with precipitates of media constituents such as serum proteins or cellular debris.