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MCB 2610 Exam 1 Questions with 100 % correct Answers | Verified | A+
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Koch and his Postulates - 1. the microorganism must be present in every case of the disease but absent in healthy individuals 2. the suspected organism must be isolated and grown in a pure culture 3. the same disease must result when the isolated microorganism is inoculated into a healthy host ...

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  • August 23, 2024
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  • 2024/2025
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MCB 2610 Exam 1

Koch and his Postulates - 1. the microorganism must be present in every case of the disease but
absent in healthy individuals



2. the suspected organism must be isolated and grown in a pure culture



3. the same disease must result when the isolated microorganism is inoculated into a healthy host



4. the same microorganism must be isolated again from the diseased host




Developments due to Koch's Postulates - 1. Agar (Fanny Hess)

2. Petri Dish (Richard Petri)

3. Nutrient broth and nutrient agar

4. Method for isolated microorganisms

5. Aseptic techniques



Agostini Bassi (1773-1856) - - showed that a disease of silkworms was caused by a fungus



Alexander Fleming - 1928



1. discovered the first antibiotic

-observed that Penicillin fungus made an antibiotic, penicillin, that killed S. aureus



Antony van Leeuwenhoek - 1632-1723

,First person to observe and describe microorganisms accurately with microscope that could magnify 50-
300 times



Called microbes --> animalcules

-had giardiasis at the time



Atomic Force Microscope - 1. sharp probe moves over surface of specimen at constant distance

2. used to study surfaces that do not conduct electricity well.



Bacillus anthracis

-Gram +/Gram - ?

-Spore Forming?

-Motile?

-Pathogenic?

-Morphology?

-Clinical Signs

-Sensitive to?

-Lifestyle - -Gram +

-forms endospores

-non-motile

-cutaneous --> most common /inhalation --> most deadly

-large rods/single short chain

-Ferdinand Cohn 1872

-edema factor/lethal/protective antigen

-Penicillin

-Mesophile, faculative anaerobe



Binomial Nomenclature - Carolus Linnaeus (1750)

, genus is always capitalized, the species is lowercase



can abbreviate after first use



Classification Schemes



Two Groups

Five Kingdoms

Three Domain System - Two Groups - Aristotle

= Plantae + Animalia



Five Kingdoms

Monera, Protista, Plantae, Animalia, Fungi



Three Domain System

- Carl Woese

- Bacteria, Archaea, Eukarya



Clostridium difficile

-Gram +/Gram - ?

-Spore Forming?

-Motile?

-Pathogenic?

-Morphology?

-Clinical Signs

-Sensitive to?

-Lifestyle - Gram +

-spore forming

-motile

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