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BIOD171 Microbiology Lab 1-9 Exams Portage Learning (Latest 2026/2027) | Questions with Verified Answers & Detailed Rationales | 100% Guaranteed Pass | Complete A+ Guide

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Ace all nine BIOD171 Microbiology lab exams at Portage Learning with this comprehensive bundle covering Labs 1 through 9. This resource features exam-style questions with verified correct answers and detailed rationales for every question – all graded A+. Fully updated for the 2026/2027 academic year, this guide covers essential microbiology laboratory topics across all lab modules: lab safety and aseptic technique, microscopy and staining procedures (Gram staining, acid-fast staining, capsule staining, endospore staining), bacterial culturing and isolation techniques, autoclave sterilization (heat, pressure, and steam at 121–125°C), biochemical assays, antibiotic sensitivity testing (Kirby-Bauer method), microbial physiology, enzyme activity, metabolic pathway experiments, environmental microbiology (soil, water, and food analysis), immunology techniques, diagnostic microbiology, epidemiology, pathogenicity, and public health microbiology. Includes verified rationales explaining the "why" behind each answer, NGN-style case studies, and lab notebook guidance. Perfect for Portage Learning students in nursing, biology, and allied health programs seeking a 100% guaranteed pass on all BIOD171 lab exams and the final.

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Page 1 of 108



BIOD171 (Latest ) Microbiology

Lab 1-9 Exams Portage Learning, 100 %

Guaranteed Pass ||Complete A+ Guide




1. Which objective lens requires oil immersion?

A) 4x

B) 10x

C) 40x

D) 100x

Answer: D) 100x

Rationale: The 100x objective has a very short working

distance; oil prevents light refraction, improving resolution.




2. What is the total magnification when using a 10x ocular

and a 40x objective?

,Page 2 of 108


A) 40x

B) 100x

C) 400x

D) 4000x

Answer: C) 400x

Rationale: Total magnification = ocular × objective = 10 ×

40 = 400x.




3. Which stain is used in the Gram stain to counterstain Gram-

negative bacteria?

A) Crystal violet

B) Iodine

C) Safranin

D) Methylene blue

Answer: C) Safranin

Rationale: Safranin stains Gram-negative cells pink after

alcohol decolorization.

,Page 3 of 108




4. The purpose of heat-fixing a smear is to:

A) Stain the bacteria

B) Kill bacteria and adhere them to the slide

C) Enhance motility

D) Decolorize the cells

Answer: B) Kill bacteria and adhere them to the slide

Rationale: Heat fixation kills cells and fixes them to the slide

without distorting morphology.




5. Which of the following is a simple stain?

A) Gram stain

B) Acid-fast stain

C) Methylene blue

D) Endospore stain

, Page 4 of 108


Answer: C) Methylene blue m. m. m.




Rationale: Simple stains use a single dye to highlight cell shape
m. m. m. m. m. m. m. m. m. m.




and arrangement.
m. m.




True/False

6. (True/False) The resolving power of a microscope improves
m. m. m. m. m. m. m.




m. as the wavelength of light increases.
m. m. m. m. m.




Answer: False m .




Rationale: Shorter wavelengths give better resolution.
m. m. m. m. m.




7. (True/False) Gram-positive bacteria retain crystal violet
m. m. m. m. m.




m. after alcohol wash because of their thick peptidoglycan layer.
m. m. m. m. m. m. m. m.




m. Answer: True m.




Rationale: The thick peptidoglycan traps the crystal violet-
m. m. m. m. m. m. m.




iodine complex. m.

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