Question 1

Which of the following best describes the scientific method as used in microbiology?

Accepted Answer

A process involving observation, hypothesis formation, experimentation, and theory development, with results published for peer review.

Question 2

Which of the following is NOT a characteristic of scientific knowledge?

Accepted Answer

It is based on unchanging dogma.

Question 3

Which of the following kingdoms contains organisms that are always multicellular and heterotrophic?

Accepted Answer

Animalia

Question 4

Which of the following statements about bacteria is TRUE?

Accepted Answer

Bacteria have a wide range of metabolic capabilities and can be beneficial or harmful.

Question 5

Which feature distinguishes archaea from bacteria?

Accepted Answer

Cell wall composition

Question 6

Which of the following is a defining characteristic of algae?

Accepted Answer

Their cell walls are made of cellulose and they are photosynthetic.

Question 7

Which of the following statements about viruses is correct?

Accepted Answer

Viruses are acellular and require a host cell to replicate.

Question 8

A scientist wants to observe the detailed structure of a bacterial flagellum. Which microscope should they use?

Accepted Answer

Transmission electron microscope (TEM)

Question 9

Which of the following is a correct calculation for total magnification using a light microscope with a 40x objective lens and a 10x ocular lens?

Accepted Answer

$$ (40 	imes 10) = 400 $$

Question 10

Which of the following is NOT a subfield of microbiology?

Accepted Answer

Entomology

Question 11

Which of the following best explains why electron microscopes cannot be used to view living specimens?

Accepted Answer

The preparation methods required for electron microscopy kill the specimens.

Question 12

Which of the following is a real-world application of molds in microbiology?

Accepted Answer

Production of antibiotics such as penicillin

Question 13

Which of the following statements about protozoa is FALSE?

Accepted Answer

Protozoa are always multicellular.

Question 14

Which of the following is a distinguishing feature of fungi compared to plants?

Accepted Answer

Fungi have cell walls made of chitin.

Question 15

Which of the following statements about helminths is correct?

Accepted Answer

Helminths are studied in microbiology because they cause diseases detectable at the microscopic level.

Question 16

Which of the following best describes the main difference between prokaryotic and eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a nucleus, while eukaryotic cells have a nucleus.

Question 17

Which type of microscope would be most appropriate for viewing live, unstained cells to observe their movement and internal structures?

Accepted Answer

Phase-contrast microscope

Question 18

Which of the following is a correct statement about the taxonomy of living things?

Accepted Answer

The domain is the broadest taxonomic category.

Question 19

Which of the following is a practical use of agar derived from algae in microbiology?

Accepted Answer

As a solidifying agent for growing microorganisms in Petri dishes

Question 20

A researcher is using a microscope with a 100x oil immersion objective and a 10x ocular lens. What is the total magnification, and why is oil used?

Accepted Answer

$$ (100 	imes 10) = 1000 $$; oil is used to increase resolution by reducing light refraction.

Introduction to Microbiology: Types of Microorganisms and Instruments of Microscopy

Study Guide - Practice Questions