Exam 1 -MCB.docx - Exam 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 Antoni van Leeuwenhoek was the

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Exam 1 1. Antoni van Leeuwenhoek was the first person in history to : view microorganisms & record these observations 2. The control of infectious disease remains challenging a century after the understanding of infectious disease began. What contributes to the continuing challenge? Both drug-resistant pathogens and emerging diseases. 3. Microorganisms characterized by the absence of a nucleus are called prokaryotes . 4. Which of the following statements concerning Koch's postulates is false? The suspected pathogen may not be present in all cases of the disease being studied. 5. Robert Koch's contributions to the foundations of modern microbiology include developing methods for isolation and identification of bacteria. 6. Identification of bacteria in the laboratory usually begins with the Gram stain for placement in one of two large groups of bacteria. 7. The work of Lister, Nightingale, and Semmelweis all contributed to controlling infectious disease by developing methods for reducing nosocomial infections 8. The study of the occurrence, distribution, and spread of disease is known as epidemiology. 9. Edward Jenner's efforts to prevent smallpox provided the foundation for the field of immunology. 10. Whose search for chemicals that would kill microbes without harming humans was the foundation for chemotherapy? Ehrilich 11. The term for the use of microorganisms to restore damaged environments is bioremediation. 12. The acid-fast stain is used to stain mycobacterium or acid fast positive bacteria. 13. All of the following are common to both the Gram stain and the acid-fast stain EXCEPT a mordant. 14. A useful unit for measuring the size of most cells is micrometers. 15. Which of the following are magnifying lenses? both the objective and the ocular. 16. The light source in a Fluorescence microscope is ultraviolet (UV) light. 17. You are shown a micrograph from a light microscope in which the specimens appear bright compared to the background. The micrograph is probably from a(n) darkfield microscope. 18. Unstained cells that lack pigment are best observed on the phase-contrast microscope. 19. High resolution images of the internal structures of microbial cells are obtained using transmission electron microscopes. 20. If a microbiology lab student left the safranin out of the Gram stain procedure, what would be the result? Gram + cells would be purple and Gram -- cells would be colorless. 21. Which of the following chemical substances contributes to the unique characteristics of acid-fast bacteria? mycolic acid 22. Some bacteria have an outer layer composed of either polypeptides or polysaccharides that protects them from desiccation and allows them to adhere to surfaces. 23. Which of the following prokaryotic cells contain an outer membrane? Gram-negative bacteria only 24. Carl Woese proposed the concept of the domain based on differences of which of the following cellular molecules? ribosomal RNA 25. The Gram stain works because of differences in the cell walls of bacteria.
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  • Spring '15
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