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exam 1 key - I pledge on my honor that I have not given or...

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I pledge on my honor that I have not given or received any unauthorized assistance on this examination. Name(Printed)_______________________________ Signature _________________________ Section ____________________________________ My TA's name is ___________________ (1 pt) This exam contains ____ pages and ____ questions (1 pt) Questions 1-30 are worth 2 pts each. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. __B__ 1) Which of the following statements regarding microorganisms is false ? A. They constitute the major portion of biomass on earth. B. Most of them cause disease in humans. C. In nature they tend to exist in assemblages called populations. D. They have the ability to reproduce, differentiate and evolve. E. They are among the oldest known life forms on earth. __C__ 2) The person whose research formed the foundation of the field of Industrial Microbiology was __ A __ 3) In aerobic respiration, the final electron acceptor might be __ B __ 4) Which of the following structures is unique to Gram-positive bacteria?
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2 5) The graph to the right illustrates the role of enzymes in a biological reaction. Which labeled portion of the graph accurately depicts the activation energy needed in the presence of an enzyme? A. B. C. D. E. __D__ 6) The tree of life classification scheme for life on earth is based on comparisons of 7) Which of the following transport processes requires the expenditure of energy, in order for a bacterium to transport a substance into the cell? 8) The structure identified in the image to the right is best described as a 9) You have isolated a bacterium from some spoiled food in your refrigerator. After isolating a pure culture of this bacterium, you inoculate it into a tube containing a broth that will support its growth. Which tube best depicts the expected distribution of bacteria within the tube, if the organism is a microaerophile?
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3 __A__ 10) From the data contained in the figure, which molecule is best described as a substrate? A. PEP B. Mg 2+ C. ATP D. Pyruvic acid E. None of the above Matching. (2 pts each) Choose the best definition from column B that defines the term or concept in column A. You may only use each definition once. Not all definitions will be used. Column A Column B __Q_ 11 Autoclave A. Characteristics of an organism displayed in an environment __M_ 12 LPS B. Facilitation of a recycling process by the addition of bacteria __E_ 13 Primary metabolite C. Mechanism of classifying bacteria based on their 16S rRNA sequences __F__ 14 Bacteriocin D. Carbohydrate containing material of a Gram-positive bacterium __R_ 15 Endoflagellum E. Compound synthesized during the log phase of growth __J__ 16 Oxidative phosphorylation F. Protein made by one bacterium which can kill a closely related bacterium __P__ 17 Superoxide G. Main energy source of a bacterium __N_ 18 Pasteurization H. Process by which all bacteria are removed from milk __B_ 19 Bioremediation I. Randomly distributed flagellum on a bacterial surface __O_ 20 Teichoic acid J. Synthesis of energy using the proton motive force K. Addition of phosphate onto a complex carbohydrate during transport L. Terminal electron acceptor used during aerobic growth M. Integral outer- membrane glycolipid N. Method of using heat to eliminate pathogens from a substance without substantially altering the substance O. Polyalcohol found in the cell wall of some organisms P. Toxic derivative of oxygen Q. Device employing steam under pressure used to sterilize material R. Flagellum found on a spirochete
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4 The data presented in the graph to the right represents the growth curve of an obligate aerobe (bacterium X) growing aerobically at 42 C at pH 7.0 in a simple defined medium (Media A). The generation o time is 30 minutes. If bacterium X is cultured in the same medium at 45 C, it has a generation time of 45 minutes. When bacterium X is o grown in media A at 37 C, it has a generation time of 15 minutes. o Use this information and the information provided in the set of graphs labeled graphs A-D below to answer questions 21-24. __B__
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