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MICR 4423 Final Exam 2025/2026 – 300+ Verified Questions & Answers | Antibiotics, Resistance Mechanisms, Microbial Physiology & Microbiome

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This in-depth exam preparation resource contains over 300 carefully verified questions and answers for the MICR 4423 Final Exam (2025/2026), ensuring full coverage of the course content. It explores the historical evolution of medicine, the transition from the four humors to germ theory, and the development of antibiotics from penicillin to modern drug classes. Detailed sections cover microbial cell structure, peptidoglycan synthesis, antibiotic modes of action, glycopeptides, β-lactams, aminoglycosides, efflux pumps, and mechanisms of genetic and non-genetic antibiotic resistance. The document also addresses advanced microbiology topics, including ESKAPE pathogens, biofilms, persister cells, antibiotic regulation and policy, microbiome composition and sequencing methods, WHO’s antimicrobial resistance plan, and future therapeutic strategies like phage therapy and novel drug targets. Designed for a wide range of learners, it is particularly useful for: Microbiology Majors in upper-level undergraduate or graduate programs Pre-Med and Pre-Pharmacy Students preparing for microbiology or pharmacology exams Biomedical Science and Public Health Students focusing on infectious diseases and antibiotic stewardship Healthcare Professionals in Training (nursing, pharmacy, medical, and veterinary fields) seeking an applied microbiology reference With clear, concise explanations and logically organized topics, this guide serves both as a comprehensive study companion and a quick-reference resource for academic success and professional readiness. Keywords: MICR 4423 exam, antibiotics, antimicrobial resistance, β-lactams, glycopeptides, aminoglycosides, efflux pumps, ESKAPE pathogens, biofilms, microbiome, phage therapy, microbial physiology, antibiotic targets, microbial genetics, WHO antimicrobial plan

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MICR 4423 - Final Exam 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+



What characterized medicine before the late 19th century? - 🧠ANSWER ✔✔the

four humors//paliative or aggressive


What were some common medical interventions? - 🧠ANSWER ✔✔Palliative and

aggressive interventions - non-curative but relieves symptoms, often did more

harm than good; make you bleed, urinate, deficate

Who defined the "four humors" theory and when was it defined? - 🧠ANSWER

✔✔Galen in 150 A.D


What are the four humors? - 🧠ANSWER ✔✔black bile, yellow bile, phlegm, and

blood

,Contrast the treatments required by the "four humors" theory of disease and the

germ theory of disease. - 🧠ANSWER ✔✔Germ Theory - finding the bacteria and

killing/stopping growth of it

4 Humors: miasma; rebalancing the humors


About when did the antibiotic age begin? - 🧠ANSWER ✔✔the first half of the

1940's

what was the first widely availible antibiotic? When were the first patients treated

with it? - 🧠ANSWER ✔✔penicillin-Albert Alexander (1941) and Ann Miller

(1942)


when did the first antibiotic become widely available ? - 🧠ANSWER ✔✔1945


who was the first person to be treated with penicillin and then went on to live out a

long life? - 🧠ANSWER ✔✔ann miller (1942)


How was the discovery of dyes that specifically stain particular cell types logically

related to the search for antibacterial drugs? - 🧠ANSWER ✔✔the dyes were able to

help distinguish between different cells and made the progress quicker

What physical property of Salvarsan and Prontosil made them difficult to

administer? - 🧠ANSWER ✔✔They were not water soluble

,What sulfanilamide-related disaster in Tulsa led to tighter federal regulations of

drug labeling and composition? - 🧠ANSWER ✔✔The toxic raspberry elixir of

sulfanilamide mixed into diethyl glycogen - killed people who took it

Who is typically credited with the discovery of penicillin? What were his key

contributions? - 🧠ANSWER ✔✔Fleming; discovered it kills bacteria and that it's

harmless to humans

What was the principal problem that prevented Fleming from developing penicillin

as a treatment? - 🧠ANSWER ✔✔wasn't able to isolate enough in a stable form to

study it further

Who composed the team that brought treatment with penicillin from an idea to

reality, and what were their roles? Where did they work? When did they conduct

the bulk of their work? - 🧠ANSWER ✔✔1. Dunn School Team


- Florey - project leader

- Chain - Chemist

- Heatley - engineer/mechanical genius

2. Worked at the Dunn School in Oxford

3. Worked from 1937-1941



3
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, What were the three key advancements in penicillin production that were made at

the Northern Lab in Peoria, IL, and how did they take place? - 🧠ANSWER ✔✔1.

hyper producing strain (from moldy cantaloupe)

2. improved medium (corn steep liquor + sugar)

3. deep tank fermentation (scale it up)

What got US pharmaceutical companies interested in penicillin production? -

🧠ANSWER ✔✔War Resources Board; Got to keep all intellectual property, $200

per million unit, tax breaks, grants to build equipment; given all the info, so

already known about about the drug


What disaster in Boston put penicillin in the spotlight? - 🧠ANSWER ✔✔The

cocoanut grove fire

After penicillin, what was the next antibiotic to be discovered? Who discovered it?

What class of antibiotics does it represent? What class of microorganisms produces

it? What was it good for that penicillin was not? - 🧠ANSWER ✔✔1. Streptomycin

- Albert Shatz

2. Class aminoglycosides

3. Class of microorganism actinomycetes

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