BIOD 171 MODULE 3 EXAM QUESTIONS & ANSWERS 2026-2027 | PO… EXAM
P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
BIOD 171 Module 3 Exam
Questions & Answers
2026-2027 | Portage
Learning Microbiology
Verified Answers Exam Ready With Rationales
32 QUESTIONS
DOCUMENT OVERVIEW
This document contains 32 exam questions with correct answers provided, along with
explanations and relevant diagrams or images. It focuses on microbiology and microscopy
concepts, ensuring a comprehensive understanding of the subject matter. This resource is
suitable for study, review, and preparation for certification exams, allowing students to
reinforce their knowledge effectively.
CONTENTS
Microscope Fundamentals Q1–Q15
Staining Techniques Q16–Q27
Cell Visualization Q28–Q32
Page 1
, E XA M Q U EST I O N S
Q1 QUESTION 1 OF 32
A nanometer is defined as:
CORRECT ANSWER
10 -9 or one-billionth of a meter
Q2 QUESTION 2 OF 32
True or False: A nanometer is longer than a micrometer
CORRECT ANSWER
False
A nanometer is 1000x smaller than a micrometer
Q3 QUESTION 3 OF 32
Resolution and contrast are two critical factors that influence your ability to see an object.
Explain each.
CORRECT ANSWER
Resolution refers to the distance between two objects at which the objects can still be seen as
separate. Poor or low resolution means two or more objects may appear as one.
Contrast on the other hand is the difference in light absorbance between two objects. Poor
contrast gives a high background and makes the visualization of multiple objects difficult. For
instance, trying to identify 2 dark colored objects at
night (low light = low contrast) versus the same 2 objects in the middle of
a sunny afternoon (bright light against 2 dark objects = high contrast).
Q4 QUESTION 4 OF 32
Assuming a fixed ocular, identify the part of the microscope you would adjust to enhance the
magnification of a sample.
Page 2
P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
BIOD 171 Module 3 Exam
Questions & Answers
2026-2027 | Portage
Learning Microbiology
Verified Answers Exam Ready With Rationales
32 QUESTIONS
DOCUMENT OVERVIEW
This document contains 32 exam questions with correct answers provided, along with
explanations and relevant diagrams or images. It focuses on microbiology and microscopy
concepts, ensuring a comprehensive understanding of the subject matter. This resource is
suitable for study, review, and preparation for certification exams, allowing students to
reinforce their knowledge effectively.
CONTENTS
Microscope Fundamentals Q1–Q15
Staining Techniques Q16–Q27
Cell Visualization Q28–Q32
Page 1
, E XA M Q U EST I O N S
Q1 QUESTION 1 OF 32
A nanometer is defined as:
CORRECT ANSWER
10 -9 or one-billionth of a meter
Q2 QUESTION 2 OF 32
True or False: A nanometer is longer than a micrometer
CORRECT ANSWER
False
A nanometer is 1000x smaller than a micrometer
Q3 QUESTION 3 OF 32
Resolution and contrast are two critical factors that influence your ability to see an object.
Explain each.
CORRECT ANSWER
Resolution refers to the distance between two objects at which the objects can still be seen as
separate. Poor or low resolution means two or more objects may appear as one.
Contrast on the other hand is the difference in light absorbance between two objects. Poor
contrast gives a high background and makes the visualization of multiple objects difficult. For
instance, trying to identify 2 dark colored objects at
night (low light = low contrast) versus the same 2 objects in the middle of
a sunny afternoon (bright light against 2 dark objects = high contrast).
Q4 QUESTION 4 OF 32
Assuming a fixed ocular, identify the part of the microscope you would adjust to enhance the
magnification of a sample.
Page 2
