Microbiology Test Bank Study Guide Questions And Correct Answers

What is the purpose of topoisomerases? A. Sits on top of DNA isomers B. Breaks one strand of DNA to relive tension from rapid unwinding of double helix C. Prevents supercoiling D. B and C {Ans: B and C}A core genome and pan-genome are defined as A. Core genome is the set of genes found in less than half the members of a monophyletic group while the pan-genome is a combination of all genes of all strains B. Pan-genome is a set of genes found in all members of a monophyletic group and a core genome is a combination of all genes of all strains. C. A core genome is a set of genes found in all members of aa monophyletic group while a pan-genome is a combination of all genes of all strains D. None of the above {Ans: A core genome is a set of genes found in all members of aa monophyletic group while a pan-genome is a combination of all genes of all strains}Global regulatory systems often use many types of regulation such as: A. Two component signal transduction systems B. Phosphorelay systems C. Regulatory proteins D. Alternative sigma factors E. All of the