Suppose you do this test on a hypothetical Staphylococcus species with the antibiotics pencilllin (p-10) and chloramphenicol (C30). You record identical zone diameters of 25 mm for the chloramphenicol and penicillin disks. Which antibiotic would be less effective against this organism? Penicillin falls to the left of the resistant zone Penicillin falls to the right of the suceptible zone zone Chlorampenicol falls to the left of the resistant zone Chlorampenicol falls to the right of the suceptible zone none of these

Suppose you do this test on a hypothetical Staphylococcus species with the antibiotics pencilllin (p-10) and chloramphenicol (C30). You record identical zone diameters of 25 mm for the chloramphenicol and penicillin disks. Which antibiotic would be less effective against this organism? Penicillin falls to the left of the resistant zone Penicillin falls to the right of the suceptible zone zone Chlorampenicol falls to the left of the resistant zone Chlorampenicol falls to the right of the suceptible zone none of these

Curren'S Math For Meds: Dosages & Sol

11th Edition

ISBN:9781305143531

Author:CURREN

Publisher:CURREN

Chapter9: Parenteral Medication Labels And Dosage Calculation

Section: Chapter Questions

Problem 1.1P

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Suppose you do this test on a hypothetical Staphylococcal species with the antibiotics penicillin and tetracycline. You record zone diameters of 20mm for the tetracycline disc and 25mm for the penicillin disc. Which antibiotic would be most effective against this organism? What does this tell you about comparing zone diameters to each other and the importance of the interpretive chart?
Suppose you do the Kirby-Bauer test on a hypothetical Staphylococcus species with penicillin and tetracycline. You record diameters of 20mm for tetracycline and 24mm for penicillin. Which antibiotic is most effective against this bacterium and why? Please explain and interpret these results.
If a bacterial species is not susceptible to an antibacterial drug at the concentration present in a particular disk, does that necessarily mean the species is completely resistant to the drug? Explain your answer. What is the mode of action of bacitracin? How does this influence the types of bacteria it can be used against effectively? What is the mode of action of tetracycline? How does this influence the types of bacteria it can be used against effectively? Describe how populations of bacteria can evolve resistance to antibiotics. In your description, use the terms/phrases: mutation, resistant, sensitive, individuals, populations, natural selection, horizontal gene transfer.
propose a hypothesis regarding the organisms (staphylococcus, escherichia, pseudomonas, and bacillus) that will be resistant to the most disinfectants, and why? if the hypothesis is supported, what specific experimental results will be observed? what would be the independent and dependent variable? zone size, disinfectant type, colony count
In a series of infection experiments, a researcher discovers that the ID50 value for the infectious bacterium Parasiticum mucoides is 2,000, and that the ID50 for another infectious bacterium, Donoteatum thisbacterium, is 150. Given these data, a person exposed to 1,000 bacteria of each type would be more likely to be infected by which bacterium? There is no way to know given the information provided Both infections are equally likely Donoteatum thisbacterium Parasiticum mucoides
You have a mixed culture of 2 different bacterial species. One of the species is Gram negative bacilli and the other species is Gram positive cocci. You have noticed that one species is killed by penicillin antibiotics (attacks peptidoglycan) while the other survives. Neither species has antibiotic resistance genes. How can you explain this result? Remember to make direct reference to each bacterial species in your response
You have isolated a strain of E.coli that is resistant to penicillin,streptomycin,chloramphenicol and tetracycline. You also observe that when you mix this strain with a strain that is sensitive to all four antibiotics, the new strain becomes resistant to streptomycin,penicillin and chloramphenicol but not tetracycline. Explain how this is so?
Imagine that you have set up a Kirby Bauer experiment on Mueller Hinton agar (non-selective agar) in order to test if Escherichia coli is susceptible or resistant to Drug X. After 24 hours, you notice a zone of inhibition (clear zone) around your antibiotic disc and determine that E. coli is susceptible to Drug X. You then take a cotton swab and subculture a sample from this zone of inhibition (where no growth was apparent) onto a new agar plate without antibiotics and after 24 hours you see growth of E.coli. What can you conclude about Drug X?
What would happen if an ampicillin reagent is added to an Lysogeny broth agar plate that is below 50 degrees Celsius. What would happen if it was added to an Lysogeny broth agar plate that is 50-55 degrees Celsius? Please draw two plates to demonstrate.
The following results were obtained from a disk diffusion test for a strain of Escherichia coli. Chemotherapeutic Zone of inhibition (mm) A 7 B 10 C 18 D 3 Which drug above (A, B, C, or D) is most effective against this E. coli strain? ***Which drug above (A, B, C, or D) is most effective against Staphylococcus aureus? Explain your answer.
After running a novobiocin sensitivity test, the zone of inhibition diameter measured 14 mm for one of the staphylococcus organisms. Based on this diameter, the organism is presumed to be__________
Streptococcus pneumoniae is a Gram-positive bacterium that colonizes the mucosal surface of the upper respiratory tract in humans. The presence of this bacterium in the nose and throat is widespread in the population, and in most people, colonization with Strep. pneumoniae is asymptomatic. The figure attached shows a comparison of in vitro growth curves of the wild-type strain of Strep. pneumoniae, as well as a Strep. pneumoniae mutant strain with a defect in one bacterial gene. The graph on the right shows the growth curve following addition of lysozyme during the logarithmic phase of bacterial growth. Which statement could account for the data in these graphs? Strain B is wild-type Strep. pneumoniae, and strain A is a mutant that cannot modify its peptidoglycan to be lysozyme-resistant. Strain B is wild-type Strep. pneumoniae, and strain A is a mutant that that expresses increased levels of LPS. Strain A is wild-type Strep. pneumoniae, and strain B is a mutant that cannot modify its…

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		Penicillin falls to the left of the resistant zone
		Penicillin falls to the right of the suceptible zone zone
		Chlorampenicol falls to the left of the resistant zone
		Chlorampenicol falls to the right of the suceptible zone
		none of these