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
,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
, 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
3
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
,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
, 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
3
