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2 pt 3 pt 4 pt 5pt 1 pt 2 pt 3 pt 4 pt 5 pt 1 pt 2pt 3 pt 4pt 5 pt 1pt 2pt 3 pt 4 pt 5 pt 1 pt 2 pt 3 pt 4pt 5 pt 1pt Bacterial Counts Oxygen and Temperature Salt and heat UV and antibiotics Staph project
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When you count colonies on a plate, is it direct, indirect, total or viable?
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Direct and viable
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When you count colonies using a spectrophotometer, is it direct, indirect, total or viable?
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Indirect and total
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As transmittance increases, turbidity increases or decreases?
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Decreases
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If you take 1ml of a culture and add it to 9 ml of media, what kind of dilution is this?
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1:10
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If you had 3 plates in front of you and 1 plate had 500 colonies, one had 120 colonies and one had 3 colonies, which one would you use to determine the concentration of bacteria in your original culture?
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The one with 120 colonies
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If your organism grew throughout a thioglycollate tube but benefited from oxygen, how would you classify it?
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Facultative anaerobe
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If an organism grows at low oxygen, what is it called?
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Microaerophile
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How would you classify an organism that grows optimally at 37 degrees C?
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Mesophile
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What is the optimal growth for Serratia marcescens and how would you classify this organism?
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25 degrees C, psychrotroph
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What color are the colonies of Serratia marcessans at 25 degrees C?
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Red or pink
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An extreme or obligate halophile grows at what salt concentration?
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15%
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Organisms that can grow at salt concentrations up to 10% are called ____________.
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Facultative halophiles
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Why are Bacillus most resistant to heat than other organisms?
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They have endospores
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What is to the time to kill all cells in a culture at a given temperature?
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Thermal death time
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What is the time, in minutes, to kill 90% of a population at a given temperature?
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Decimal reduction time
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What does UV irradiation do to the DNA?
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It creates thymine dimers
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Is UV radiation ionizing or nonionizing?
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Nonionizing
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For the UV experiment, the side of the plate covered with the index card, had more or less colonies?
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More
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When you place an antibiotic disc on a bacterial plate, do you measure the radius or diameter of the zone of inhibition the next day?
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Diameter
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What are some reasons for antibiotic resistance?
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Using antibiotics too often or when not needed Plasmids with antibiotic resistance genes Bacteria can pump out antibiotics
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Is the m-Staph broth, selective, differential or both?
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Selective
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Are the MSA plates selective, differential or both?
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Both
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SHOULD Novobiocin be sensitive towards Staphlocococcus aureus, Staphylococcus epidermidis or both?
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Both
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How does Staphyloslide work?
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The antibodies in Staphyloslide bind to the antigens on Staph. aureus
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Which organism(s) tests positive for coagulase?
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Staphylococcus aureus
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