Question 1

Which of the following metric units is most appropriate for measuring the diameter of a typical bacterial cell?

Accepted Answer

Micrometer ($$\mum)$$

Question 2

Arrange the following metric units of length in order from largest to smallest: meter, nanometer, millimeter, micrometer.

Accepted Answer

Meter, millimeter, micrometer, nanometer

Question 3

Which of the following best defines microscopy?

Accepted Answer

The use of light or electrons to magnify objects

Question 4

Magnification in microscopy is best described as:

Accepted Answer

The increase in the apparent size of an object

Question 5

Which two factors determine the resolving power of a microscope?

Accepted Answer

Wavelength of radiation and numerical aperture

Question 6

A student is having trouble distinguishing between two closely spaced bacteria under a microscope. Which of the following would most likely improve the resolving power?

Accepted Answer

Increasing the numerical aperture of the objective lens

Question 7

How does staining a specimen improve contrast in microscopy?

Accepted Answer

By increasing the difference in light absorption between the specimen and its background

Question 8

Which of the following best describes the difference between a simple microscope and a compound microscope?

Accepted Answer

A simple microscope uses only one lens, while a compound microscope uses multiple lenses

Question 9

Which microscopy technique is best for observing live, unstained microorganisms with enhanced contrast?

Accepted Answer

Dark-field microscopy

Question 10

A researcher wants to observe the internal structures of a living protozoan without staining. Which microscopy technique should they use?

Accepted Answer

Phase-contrast microscopy

Question 11

Which of the following statements correctly compares fluorescence microscopy and confocal microscopy?

Accepted Answer

Both use fluorescent dyes, but confocal microscopy uses a laser to focus on a single plane, producing sharper images

Question 12

Which of the following best describes the main difference between transmission electron microscopes (TEM) and scanning electron microscopes (SEM)?

Accepted Answer

TEM provides detailed images of internal structures, while SEM provides detailed images of surface structures

Question 13

What is the primary purpose of heat fixation in preparing a bacterial smear for microscopy?

Accepted Answer

To kill the bacteria and adhere them to the slide

Question 14

Which of the following statements about acidic and basic dyes is correct?

Accepted Answer

Basic dyes bind to negatively charged cell structures due to ionic attraction

Question 15

Which of the following is NOT a type of differential stain?

Accepted Answer

Simple stain

Question 16

Why is taxonomy important in microbiology?

Accepted Answer

It allows scientists to classify and organize organisms, facilitating communication and research

Question 17

Which of the following is a major difficulty in defining species among microorganisms?

Accepted Answer

Microorganisms often exchange genetic material horizontally, blurring species boundaries

Question 18

What is binomial nomenclature?

Accepted Answer

A system of naming organisms using two names: genus and species

Question 19

According to Woese and Fox, which of the following are the three domains of life?

Accepted Answer

Bacteria, Archaea, Eukarya

Question 20

Which of the following is NOT a procedure taxonomists use to identify and classify microorganisms?

Accepted Answer

Gram staining only

Ch 4: Microscopy, Staining, and Classification: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards