BIOD 171 Module 4: Microbiology | Portage Learning Study Guide | Questions, Answers & Detailed Rationales

BIOD 171 x




Module 4: Microbiology | Portage Learning Study Guide
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| Questions, Answers & Detailed Rationales
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THIS STUDY RESOURCE INCLUDES x x x




• BIOD 171 Module 4 practice questions
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• Questions and answers with detailed rationales
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• Microbial growth and reproduction
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• Factors affecting microbial growth
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• Microbial metabolism concepts x x




• Environmental requirements of microorganisms x x x




• Bacterial growth phases x x




• Microbial control concepts x x




• Methods of controlling microbial populations
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• Antimicrobial agents and their principles x x x x




• Laboratory and clinical applications x x x




• Scenario-based practice questions x x




• Exam-focused microbiology review x x

, BIOD 171 Module 4: Microbiology | Portage Learning Study
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Guide | Questions, Answers & Detailed Rationales
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Question 1 x




Growth media is best suited for distinguishing between two similar
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x species of bacteria. x x




A) True x




B) False x




C) Only if supplemented with antibiotics
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D) Only for gram-positive bacteria
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Answer: B) False x x




Rationale: Growth media is designed to simply support microbial growth,
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not to restrict or distinguish between species. Differential media is
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specifically formulated to distinguish between similar microbes based on
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their biochemical characteristics.
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Question 2 x




A researcher needs to determine which of two vials contains E. coli and
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x which contains Salmonella. Both are gram-negative, but only one
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x ferments lactose. Which type of media would be best suited?
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A) Selective media
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B) Enriched media
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, C) Differential media
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D) Complex media
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Answer: C) Differential media
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Rationale: Differential media distinguishes between two or more related
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microbes based on their metabolic characteristics. Since one organism
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ferments lactose and the other does not, a differential medium containing
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lactose and a pH indicator would allow visualization of this difference.
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Question 3 x




What are the requirements of a fastidious microbe?
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A) Basic nutrients and water
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B) Only inorganic compounds
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C) Complex growth requirements with specific essential nutrients
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D) High temperature only
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Answer: C) Complex growth requirements with specific essential
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x nutrients

Rationale: A fastidious microbe is an organism with complex growth
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requirements. If these specific essential nutrients are absent, the organism
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will not grow. Enriched media contain these specific nutrients required for
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the growth of particular microorganisms.
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Question 4 x