Silver may be used to coatingendotracheal tubes. Silver is an excellent antimicrobial againsts a number of infectious agents acting as a non-competitive inhibitor of enzymes. Which of the following apply to HOW the silver functions to kill bacteria? None of the statements apply Denatures enzymes and other proteins leading to cell death Induction of spontaneous mutations in the circular chromosome leading to a loss of antibiotic resistance in the bacteria
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- Suppose you spilled two cultures of Salmonella typhimur-ium (each containing 100,000 cells) on your lab bench. You im-mediately applied the same disinfectant to both cultures at thesame time. One culture had been freshly grown for 36 hours andthe other culture is 2 weeks old. If the kill ing rate of the disin-fectant is 90% per minute, do you think that microbes in bothcultures will be completely killed after 6 minutes? Why or whynot?Changes in the bacterial genome can lead to resistance to antimicrobialdrugs. what the different ways that these changes in the DNA occur?Explain this statement "Antineoplastic natural products- Ricin".please explain at your own words.
- of bacteria. The Gram stain works because of differences in the O 1) cell membranes O 2) genetic characteristics O 3) capsules O 4) antigens O 5) cell walls60) An investigator is studying the immune response to an encapsulated strain of staphyloccoccus aureus. Two bacterila culture tubes are treated with human serum. Culture X contains a patient with a genetic deficiency in mannose bisning protein. Culturte Y contains serum form from a healthy individual. After 1 hour. bacterial lysis in culture Yis greater than thqatobtained in culture X. The investigator hypothesizes that the mannose bidning lectin activatesimmune system componentswith serum lysis of the bacteria. Which of the following system complements most likely performs this functions? (A) Complement (B) Eosinophil major basic protein (C) IgM (D) Lysozyme (E) Perforin (F) Toll-like receptorWhich antimicrobial agents have the narrowest spectrum of action? antivirals antifungals beta-lactams sulfanilamidesBottom of Form Penicillin is a narrow spectrum antibiotic because it only affects bacteria with mycolic acid in its cell wall, such as Mycobacterium tuberculosis. it only affects viruses it only affects Gram-negative organisms it only affects Gram-positive organismsBottom of Form Which of the following antibiotics might be destroyed by beta-lactamase enzymes? amphotericin B and ciprofloxacin streptomycin penicillin ciprofloxacinBottom of Form Which is incorrect about how the pharmaceutical industry has discovered drugs over the past 100 years? The process of discovery has involved custom-designing chemical compounds that we know will bind to target enzymes. The process of discovery has involved screening for chemicals that are toxic to bacteria while being less toxic to human cells. The process of discovery has involved screening thousands of randomly…
- The first step for directly linking a microbe to a specific disease according to Koch's postulates is to O isolate microbes from the blood of healthy animals. obtain a sample of blood or other body fluid from a diseased animal. O culture the blood or other body fluid from a discased animal using nutrient medium. O inject a sample of blood or other body fluid from a diseased animal into a healthy animal. O compare the blood of a sick animal to blood obtained from a healthy animal.Transfer of resistance to a new family of antimicrobial agents from one strain to another s following a genetic mechanisms? 1) Conjugation 2) Transduction 3) Transformation 4) Transposition 5) RecombinationDetergents that are good micelle formers often have strongantibacterial properties. Considering the structure of thecell membrane, suggest a reason for this antibacterialaction.
- Before development of a vaccine against this microbe, thedisease it caused accounted for two-thirds of bacterial meningi-tis cases during the first year of life but is still the number oneleading cause of mental retardation in patients who survive seri-ous disease due to permanent central nervous system disorders.What is the microorganism?(a) Haemophilus influenzae type B(b) Haemophilus influenzae type A(c) Neisseria meningitidis(d) Streptococcus pneumoniae(e) Listeria monocytogenesPART C (cont'd) Which of the following steps (on this page and the next page) would be necessary to determine the most effective antibiotic for a bacterial infection using the Disk Diffusion Assay? Select three necessary steps and three unnecessary or incorrect steps, and explain why it is or is not necessarv/correct. Collect a sample of bacteria from the infected patient. Collect samples of bacteria from the bathroom taps in the patient's room. Collect samples of bacteria from other patients who seem to have the same infection. Soak disks in many different types of antibiotic. Soak disks in the antibiotic you have the biggest supply ot. Label the disks with the type of antibiotic you soaked them in.PART C (cont'd) Which of the following steps (on this page and the next page) would be necessary to determine the most effective antibiotic for a bacterial infection using the Disk Diffusion Assay? Select three necessary steps and three unnecessary or incorrect steps, and explain why it is or is not necessarv/correct. Collect a sample of bacteria from the infected patient. Collect samples of bacteria from the bathroom taps in the patient's room. Collect samples of bacteria from other patients who seem to have the same infection. Soak disks in many different types of antibiotic. Soak disks in the antibiotic you have the biggest supply ot. Label the disks with the type of antibiotic you soaked them in. • Leave the petri dishes uncovered while the bacteria grow. , cover the petri dishes while the bacteria grow. Treat the bacterial culture with a disinfectant before spreading on the agar plate Wear personal protective equipment (gloves, mask, lab coat) while performing the procedure Wear…