Q: Which of the following is the correct formula for calculating the total magnification when using a compound microscope?

$$\text{Total Magnification} = \text{Objective Lens} \times \text{Ocular Lens}$$

Q: What is the resolving power formula for a microscope, and what does a smaller resolving power indicate?

$$\text{Resolving Power} = \frac{\text{Wavelength of light}}{2 \times \text{Numerical Aperture}}$$; a smaller resolving power means finer details can be seen.

Question 1

Which of the following is the correct formula for calculating the total magnification when using a compound microscope?

Accepted Answer

$$	ext{Total Magnification} = 	ext{Objective Lens} 	imes 	ext{Ocular Lens}$$

Question 2

A student is using a microscope with a 10x ocular lens and a 40x objective lens. What is the total magnification?

Accepted Answer

$$400$$

Question 3

Which biosafety level (BSL) is appropriate for working with pathogens that can be transmitted by the respiratory route and requires special facilities with self-closing, double doors and sealed windows?

Accepted Answer

BSL-3

Question 4

Which of the following practices is NOT recommended for maintaining biosafety in the microbiology lab?

Accepted Answer

Bringing electronic devices into the lab

Question 5

What is the resolving power formula for a microscope, and what does a smaller resolving power indicate?

Accepted Answer

$$	ext{Resolving Power} = \frac{	ext{Wavelength of light}}{2 	imes 	ext{Numerical Aperture}}$$; a smaller resolving power means finer details can be seen.

Question 6

Which of the following is a correct safety procedure if a culture is spilled in the lab?

Accepted Answer

Cover the spill with paper towels and saturate with disinfectant immediately.

Question 7

Which historical figure was the first to document seeing microorganisms using a simple microscope?

Accepted Answer

Antoni van Leeuwenhoek

Question 8

A student observes a specimen using the oil immersion lens (100x) and a 10x ocular lens. What is the total magnification?

Accepted Answer

$$1000$$

Question 9

Which of the following is NOT a recommended attire for the microbiology laboratory?

Accepted Answer

Wearing jeans or tight-fitting slacks

Question 10

Which chemical hazard symbol indicates a substance that may explode due to heat, shock, or friction?

Accepted Answer

Explosive

Question 11

Which part of the microscope is responsible for gathering and focusing light from the illuminator onto the specimen?

Accepted Answer

Condenser

Question 12

A student is colorblind and is having difficulty with a staining technique that requires color discrimination. What is the best course of action?

Accepted Answer

Inform the instructor for possible accommodations.

Question 13

Which of the following is the correct order of steps when using a brightfield compound microscope to observe a specimen?

Accepted Answer

Start with the lowest power lens, focus slowly, then switch to higher power lenses.

Question 14

Which of the following bacterial shapes is correctly matched with its description?

Accepted Answer

Cocci: Sphere-shaped

Question 15

Which biosafety level (BSL) is used for work with pathogens that may be transmitted via aerosols and for which there is no vaccine or treatment?

Accepted Answer

BSL-4

Question 16

If a student accidentally cuts themselves with a contaminated needle in the lab, what is the FIRST action they should take?

Accepted Answer

Report the incident to the instructor immediately.

Question 17

Which of the following prefixes refers to the brain?

Accepted Answer

Encephalo-

Question 18

Why is it important to label all experiments with your name and lab section in a microbiology lab?

Accepted Answer

To ensure accurate identification and prevent mix-ups of cultures.

Question 19

Which of the following is a plausible consequence of not cleaning the microscope lenses after use?

Accepted Answer

Reduced image clarity and possible damage to the lenses.

Question 20

A student is preparing to use the oil immersion lens. Which of the following steps is essential for proper use?

Accepted Answer

Apply a drop of oil to the slide before using the oil immersion lens.

Microbiology Lab Introduction, Safety, and Microscopy Study Guide

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