MICROBIOLOGY EXAM 2 NEWEST ACTUAL EXAM COMPLETE 350 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+

1 | P a g e MICROBIOLOGY EXAM 2 NEWEST 2024-2025 ACTUAL EXAM COMPLETE 350 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+ Which statement is NOT an aim in the use of drugs in antimicrobial chemotherapy? a. have selective toxicity b. be active even in high dilutions c. be broken down and excreted rapidly d. be microbicidal - ANSWER- c. be broken down and excreted rapidly Drugs that prevent the formation of the bacterial cell wall are a. quinolones b. beta-lactams c. tetracyclines d. aminoglycosides - ANSWER- b. beta-lactams Microbial resistance to drugs is acquired through a. conjugation b. transformation c. transduction d. all of these - ANSWER- d. all of these 2 | P a g e R factors are ______ that contains a code for ______ a. genes, replication b. plasmids, drug resistance c. transposons, interferon d. plasmids, conjugation - ANSWER- b. plasmids, drug resistance Phage therapy is a technique that uses a. chemicals to destroy phages infecting human cells b. chemicals to foster the growth of beneficial phages in the body c. phages to foster the growth of beneficial phages in the body d. phages to target pathogenic bacteria in the body - ANSWER- d. phages to target pathogenic bacteria in the body Most antihelminthic drugs function by a. weakening the worms so they can be flushed out by the intestine b. inhibiting worm metabolism c. blocking the absorption of nutrients d. inhibiting egg production - ANSWER- b. inhibiting worm metabolism Which of the following modes of action would be most selectively toxic? a. interrupting ribosomal function b. dissolving the cell membrane 3 | P a g e c. preventing cell wall synthesis d. inhibiting DNA replication - ANSWER- c. preventing cell wall synthesis The MIC is the _______ of a drug that is required to inhibit growth of a microbe. a. largest concentration b. standard dose c. smallest concentration d. lowest dilution - ANSWER- c. smallest concentration An antimicrobial drug with a _____ therapeutic index is a better choice than one with a _____ therapeutic index. a. low, high b. high, low - ANSWER- b. high, low True or false? Most antiviral agents work by destroying active viruses - ANSWER- False. Most antiviral agents work by blocking an essential viral activity True or false? Sulfonamide drugs work by disrupting protein synthesis - ANSWER- False. Sulfonamide drugs work by disrupting folic acid synthesis 4 | P a g e True or false? Biofilms are difficult to treat and don't always respond to antibiotics - ANSWER- True True or false? An antibiotic that disrupts the host's normal biota can cause a superinfection - ANSWER- True True or false? Drug resistance can occur when a patient's immune system becomes reactive to a drug - ANSWER- False. Drug resistance can occur when a bacterium stops being susceptible to an antibiotic A critically ill patient enters your emergency room, exhibiting signs and symptoms of severe septic shock. In this case, should you immediately begin treatment with a broad-spectrum drug or a narrow-spectrum drug? Explain your answer and discuss any possible consequences of using either drug in the patient. - ANSWER- Broad spectrum since the source is unknown, the larger the scale the more likely the drug is to help. Consequences of narrow would be that the bacteria it targets is not the one affecting patient and with broad, the patient has greater risk of developing resistance to drugs used A friend was recently diagnosed with strep throat. One week after his treatment, he redeveloped the infection. In conversation, your friend tells you, "I must have become immune to the drug the doctor gave me!" a. Discuss the validity of your friend's statement, providing evidence in support of or refuting his claim. - ANSWER- He himself cannot become immune to the drug, instead the bacteria is no longer susceptible to the drug.