Final Exam Prep - Exam Questions Questions And Complete Correct Answers

What is the mode of action of bacitracin? 1) It blocks the crosslinking of peptidoglycan strands 2) It inhibits the transport of peptidoglycan subunits to the cell wall 3) It inhibits the elongation of peptidoglycan strands 4) It dissolves phospholipids and disrupts the cytoplasmic membrane integrity 5) It blocks transcription by inhibiting bacterial RNA polymerase {Ans: 2) It inhibits the transport of peptidoglycan subunits to the cell wall}Which of the following organisms is the most resistant to antimicrobial agents? 1) Enveloped viruses 2) Non-enveloped viruses 3) Fungi 4) Bacterial endospores 5) Gram negative bacteria {Ans: 4) Bacterial endospores}Concerning the lactose operon, which of the following happens only when lactose is present? 1) The mRNA of the repressor gene is transcribed 2) The repressor protein binds to the operator 3) The inducer binds the repressor 4) The inducer binds to the promoter 5) The mRNA of the lactose catabolism genes is not transcribed {Ans: 3) The inducer binds the repressor}Which of the following are virulence factors contributing the pathogenicity of Neisseria species? 1) hemolysin 2) fimbriae 3) a capsule 4) exotoxins 5) both a capsule and fimbriae {Ans: 5) both a capsule and fimbriae}Which of the following