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Bio171 Microbio Module 5 Exam Questions and Answers | Latest Version | 2025/2026 | Correct & Verified
What type of microorganisms can grow without oxygen but are not harmed by it?✔✔ Facultative anaerobes
What term describes the time it takes for a bacterial population to double?✔✔ Generation time
What device is commonly used to measure bacterial growth in a liquid culture by light absorbance?✔✔ Spectrophotometer
What phase of bacterial growth is marked by active cell division?✔✔ Log phase
What phase of bacterial growth shows equal rates of cell death and reproduction?✔✔ Stationary phase 1 / 3
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What environmental factor can denature bacterial enzymes if too high?✔✔ Temperature
What type of medium contains nutrients to support the growth of a wide variety of organisms?✔✔ General-purpose medium
What type of culture medium suppresses unwanted microbes while encouraging desired ones?✔✔ Selective medium
What term describes microbes that grow best at moderate temperatures?✔✔ Mesophiles
What term refers to microbes that thrive in high-salt environments?✔✔ Halophiles
What pH range do most bacteria prefer?✔✔ Near neutral (around 7) 2 / 3
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What term describes microbes that require high carbon dioxide levels to grow?✔✔ Capnophiles
What is the purpose of agar in culture media?✔✔ Solidifying agent
What is the process of using high heat for a short time to reduce microbial numbers in food?✔✔ Pasteurization
What is the name of a continuous culture system used in industrial microbiology?✔✔ Chemostat
What term describes the lowest temperature at which a microbe can grow?✔✔ Minimum growth temperature
What term describes the highest temperature at which a microbe can still grow?✔✔ Maximum growth temperature
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