Portage Learning Microbiology
BIOD 171 | Module 5 Exam |
Questions & Verified Answers | A+
Graded | 2025/2026 Edition
Section 1: Introduction
This document provides the verified Module 5 Exam for BIOD 171 – Microbiology from
Portage Learning, updated for the 2025/2026 academic cycle. It covers microbial control
methods, including physical and chemical agents, and their applications. All questions
include 100% accurate answers, A+ graded, to support mastery of disinfection and
sterilization.
Section 2: Exam Questions and Answers
Format: Multiple-choice questions
• Four answer choices per question (A–D)
• Correct answer highlighted in lime green (#32CD32)
• Includes clarifying notes where applicable
1. What is the primary goal of sterilization?
(a) Reduce microbial load
(b) Kill all microorganisms
(c) Inhibit growth
(d) Remove spores
Kill all microorganisms
Note: Includes spores and viruses.
2. Which method uses high temperature to kill microbes?
(a) Filtration
(b) Radiation
(c) Heat
(d) Chemicals
Heat
Note: Includes autoclaving and dry heat.
3. What is the minimum temperature for autoclaving?
(a) 100°C
(b) 121°C
, (c) 150°C
(d) 180°C
121°C
Note: At 15 psi for 15 minutes.
4. Which process uses moist heat?
(a) Incineration
(b) Autoclaving
(c) Dry heat
(d) UV radiation
Autoclaving
Note: Steam penetrates cells effectively.
5. What is the purpose of pasteurization?
(a) Sterilize equipment
(b) Kill pathogens in liquids
(c) Remove spores
(d) Dry surfaces
Kill pathogens in liquids
Note: Used for milk and beverages.
6. Which method uses dry heat?
(a) Boiling
(b) Autoclaving
(c) Incineration
(d) Filtration
Incineration
Note: Burns microbes to ash.
7. What is the role of UV radiation?
(a) Sterilizes surfaces
(b) Damages DNA
(c) Kills spores
(d) Removes water
Damages DNA
Note: Causes thymine dimers.
8. Which filter pore size removes bacteria?
(a) 0.1 μm
BIOD 171 | Module 5 Exam |
Questions & Verified Answers | A+
Graded | 2025/2026 Edition
Section 1: Introduction
This document provides the verified Module 5 Exam for BIOD 171 – Microbiology from
Portage Learning, updated for the 2025/2026 academic cycle. It covers microbial control
methods, including physical and chemical agents, and their applications. All questions
include 100% accurate answers, A+ graded, to support mastery of disinfection and
sterilization.
Section 2: Exam Questions and Answers
Format: Multiple-choice questions
• Four answer choices per question (A–D)
• Correct answer highlighted in lime green (#32CD32)
• Includes clarifying notes where applicable
1. What is the primary goal of sterilization?
(a) Reduce microbial load
(b) Kill all microorganisms
(c) Inhibit growth
(d) Remove spores
Kill all microorganisms
Note: Includes spores and viruses.
2. Which method uses high temperature to kill microbes?
(a) Filtration
(b) Radiation
(c) Heat
(d) Chemicals
Heat
Note: Includes autoclaving and dry heat.
3. What is the minimum temperature for autoclaving?
(a) 100°C
(b) 121°C
, (c) 150°C
(d) 180°C
121°C
Note: At 15 psi for 15 minutes.
4. Which process uses moist heat?
(a) Incineration
(b) Autoclaving
(c) Dry heat
(d) UV radiation
Autoclaving
Note: Steam penetrates cells effectively.
5. What is the purpose of pasteurization?
(a) Sterilize equipment
(b) Kill pathogens in liquids
(c) Remove spores
(d) Dry surfaces
Kill pathogens in liquids
Note: Used for milk and beverages.
6. Which method uses dry heat?
(a) Boiling
(b) Autoclaving
(c) Incineration
(d) Filtration
Incineration
Note: Burns microbes to ash.
7. What is the role of UV radiation?
(a) Sterilizes surfaces
(b) Damages DNA
(c) Kills spores
(d) Removes water
Damages DNA
Note: Causes thymine dimers.
8. Which filter pore size removes bacteria?
(a) 0.1 μm
