Portage Learning Microbiology
BIOD 171 | Module 1 Exam | All
Versions | Verified Questions and
Answers | A+ Graded | 2025/2026
Edition
Section 1: Introduction
This document contains all the latest verified versions of the Module 1 Exam for BIOD 171 –
Microbiology from Portage Learning, updated for the 2025/2026 academic cycle. It includes
100% accurate answers to key foundational microbiology topics such as microbial
classification, cell types (prokaryotes vs. eukaryotes), microscopy, staining techniques, and
historical figures in microbiology. Each exam version is A+ graded, making this guide ideal
for mastering the first module and building a solid base for future coursework.
Section 2: Exam Questions and Answers
Format: Multiple-choice questions from all current Module 1 versions
• Four answer choices per question (A–D)
• Correct answer highlighted
• Includes clarifying notes and definitions to reinforce key concepts
1. What is the primary difference between prokaryotic and eukaryotic cells?
(a) Prokaryotes have a nucleus
(b) Eukaryotes lack a cell wall
(c) Prokaryotes lack a defined nucleus
(d) Eukaryotes are smaller than prokaryotes
Prokaryotes lack a defined nucleus
Note: Prokaryotes have a nucleoid region, while eukaryotes have a membrane-bound
nucleus.
2. Who is credited with developing the first microscope?
(a) Louis Pasteur
(b) Antonie van Leeuwenhoek
(c) Robert Koch
(d) Alexander Fleming
Antonie van Leeuwenhoek
Note: Leeuwenhoek’s simple microscope enabled the observation of microorganisms.
, 3. Which staining technique is used to differentiate Gram-positive and Gram-negative
bacteria?
(a) Acid-fast stain
(b) Gram stain
(c) Spore stain
(d) Capsule stain
Gram stain
Note: Gram-positive bacteria retain crystal violet, while Gram-negative do not.
4. What is the primary function of a condenser in a microscope?
(a) Magnify the specimen
(b) Focus light onto the specimen
(c) Hold the slide in place
(d) Adjust the eyepiece
Focus light onto the specimen
Note: The condenser enhances illumination for better visibility.
5. Which of the following is a characteristic of all prokaryotes?
(a) Presence of mitochondria
(b) Single circular chromosome
(c) Complex membrane-bound organelles
(d) Linear DNA
Single circular chromosome
Note: Prokaryotes typically have a single circular DNA molecule in the nucleoid.
6. Who proposed the germ theory of disease?
(a) Robert Koch
(b) Louis Pasteur
(c) Ignaz Semmelweis
(d) Joseph Lister
Louis Pasteur
Note: Pasteur’s experiments linked microorganisms to disease causation.
7. What is the purpose of the oil immersion technique in microscopy?
(a) Increase magnification
(b) Reduce light refraction
(c) Stain the specimen
(d) Clean the lens
BIOD 171 | Module 1 Exam | All
Versions | Verified Questions and
Answers | A+ Graded | 2025/2026
Edition
Section 1: Introduction
This document contains all the latest verified versions of the Module 1 Exam for BIOD 171 –
Microbiology from Portage Learning, updated for the 2025/2026 academic cycle. It includes
100% accurate answers to key foundational microbiology topics such as microbial
classification, cell types (prokaryotes vs. eukaryotes), microscopy, staining techniques, and
historical figures in microbiology. Each exam version is A+ graded, making this guide ideal
for mastering the first module and building a solid base for future coursework.
Section 2: Exam Questions and Answers
Format: Multiple-choice questions from all current Module 1 versions
• Four answer choices per question (A–D)
• Correct answer highlighted
• Includes clarifying notes and definitions to reinforce key concepts
1. What is the primary difference between prokaryotic and eukaryotic cells?
(a) Prokaryotes have a nucleus
(b) Eukaryotes lack a cell wall
(c) Prokaryotes lack a defined nucleus
(d) Eukaryotes are smaller than prokaryotes
Prokaryotes lack a defined nucleus
Note: Prokaryotes have a nucleoid region, while eukaryotes have a membrane-bound
nucleus.
2. Who is credited with developing the first microscope?
(a) Louis Pasteur
(b) Antonie van Leeuwenhoek
(c) Robert Koch
(d) Alexander Fleming
Antonie van Leeuwenhoek
Note: Leeuwenhoek’s simple microscope enabled the observation of microorganisms.
, 3. Which staining technique is used to differentiate Gram-positive and Gram-negative
bacteria?
(a) Acid-fast stain
(b) Gram stain
(c) Spore stain
(d) Capsule stain
Gram stain
Note: Gram-positive bacteria retain crystal violet, while Gram-negative do not.
4. What is the primary function of a condenser in a microscope?
(a) Magnify the specimen
(b) Focus light onto the specimen
(c) Hold the slide in place
(d) Adjust the eyepiece
Focus light onto the specimen
Note: The condenser enhances illumination for better visibility.
5. Which of the following is a characteristic of all prokaryotes?
(a) Presence of mitochondria
(b) Single circular chromosome
(c) Complex membrane-bound organelles
(d) Linear DNA
Single circular chromosome
Note: Prokaryotes typically have a single circular DNA molecule in the nucleoid.
6. Who proposed the germ theory of disease?
(a) Robert Koch
(b) Louis Pasteur
(c) Ignaz Semmelweis
(d) Joseph Lister
Louis Pasteur
Note: Pasteur’s experiments linked microorganisms to disease causation.
7. What is the purpose of the oil immersion technique in microscopy?
(a) Increase magnification
(b) Reduce light refraction
(c) Stain the specimen
(d) Clean the lens
