BIOS 242 MICROBIOLOGY WEEK 2 QUIZ / BIOS242 MICROBIOLOGY WEEK 2 QUIZ(LATEST)|ALL ANSWERS VERIFIED,100% CORRECT -Chamberlain College of Nursing

BIOS 242 MICROBIOLOGY WEEK 2 QUIZ / BIOS242 MICROBIOLOGY WEEK 2 QUIZ(LATEST)|ALL ANSWERS VERIFIED,100% CORRECT -Chamberlain College of NursingBIOS 242 MICROBIOLOGY WEEK 2 QUIZ Quiz 2 Microbiology Question 1 (TCO 3) Cellular organelles and viruses are generally measured in _____. Correct! nanometers millimeters micrometers centimeters decimeters Chapter 4: Microscopy, Staining, and Classification Question 2 (TCO 3) Why does immersion oil improve resolution? It allows light to travel at a uniform speed on its way to the lens. It decreases the working distance. It increases the numerical ! It increases numerical aperture and maintains a uniform light speed. It increases the angle of refraction of the light. Chapter 4: Microscopy, Staining, and Classification Question 3 (TCO 3) A patient with tuberculosis could be diagnosed by use of the _____ stain. Gram endospore acid-fast flagellar capsule Chapter 4: Microscopy, Staining, and Classification Question 4 (TCO 3) The rules of naming organisms are called _____. taxonomyrrect! nomenclature classification binomials identification Chapter 4: Microscopy, Staining, and Classification Question 5 (TCO 3) Which of the following statements about transmission electron microscopy is false? Thin segments must be used. Electrons are the source of illumination. Correct! Glass lenses are used. The sample is placed in a vacuum. Stains can be applied to improve contrast. Chapter 4: Microscopy, Staining, and Classification Question 6 (TCO 4) A cell that uses an organic carbon source and obtains energy from light would be called a _____. photoheterotroph lithoautotroph photoautotroph chemoheterotroph chemoautotroph Chapter 6: Microbial Growth and Nutrition Question 7 (TCO 4) Human pathogens are classified as _____. thermoduric thermophilesCorrect! mesophiles hyperthermophiles psychrophiles Chapter 6: Microbial Growth and Nutrition Question 8 (TCO 4) Organisms that can grow with or without oxygen present are _____. obligate aerobes facultative anaerobes aerotolerant anaerobes obligate anaerobesorrect! either facultative anaerobes or aerotolerant anaerobes Chapter 6: Microbial Growth and Nutrition Question 9 (TCO 4) The use of salt and sugar in preserving various types of foods is an application of which of the following concepts? Nitrogen fixationCorrect! Osmotic pressure pH Hydrostatic pressure Quorum sensing Chapter 6: Microbial Growth and Nutrition Question 10 (TCO 4) During the _____ of growth, new cells are being produced at the same rate as other cells are dying. lag phase log phase death phase stationary phase intermediate phase Chapter 6: Microbial Growth and Nutrition Question 11 (TCO 4) Compare and contrast the streak-plate method of isolation with the pour-plate method of isolation. Your Answer: Streaking technique is used to isolate the bacteria and form pure bacterial cultures, it is the simplest form of bacterial isolation, streaking is generally done by the sterile loop or cotton swab. The three streaking techniques are T-streak technique, Continuous streak and Quadrant streak technique. As for pour-plate method of isolation, the diluted samples are poured into the petri dish, allowed to dry for few seconds and then incubated. This techniques is quantitative, we know the dilution of sample and the number of colonies obtained are counted. The dilutions are continued until a countable number of colonies are obtained. This technique needs repeated inoculation of the sample to isolate the required bacteria. Chapter 6: Microbial Growth and Nutrition The streak-plate and the pour-plate methods of bacterial isolation are both used to produce pure cultures of bacteria from specimens. Both techniques involve the use of agar-based growth media contained in Petri plates. Additionally, both techniques involve the use of dilutions as a means of isolating single cells or groups of cells that then grow into isolated colonies. But there are several significant differences between the two techniques. The main difference is the way in which the specimen is diluted. In the streak-plate method, the specimen is diluted by use of an inoculating loop that spreads organisms over the surface of the agar. Thus, colonies appear only on the agar surface. In the pour-plate method, however, dilutions of the specimen are made in tubes of broth and then each dilution is added to melted agar, which is then poured into Petri dishes. Thus, microbes are mixed throughout the agar, and colonies will appear both in and on the medium. Quiz Score: 28 out of 30