Question 1

Which of the following best describes the primary focus of the BIO140 Microbiology and Immunology course?

Accepted Answer

The examination of the microbial world, their biological properties, and their relationship to humans, including infectious disease transmission, prevention, and immunity.

Question 2

A student is preparing a Gram stain in the laboratory. Which of the following steps is essential for correctly identifying Gram-positive bacteria?

Accepted Answer

Decolorizing with alcohol after applying iodine.

Question 3

Which of the following is a non-specific defense mechanism of the host?

Accepted Answer

Phagocytosis by neutrophils and macrophages.

Question 4

A patient presents with pneumonia. Which laboratory method would most likely be used to identify the causative bacterial agent?

Accepted Answer

Gram stain and culture of sputum sample.

Question 5

Which of the following best describes the Kirby-Bauer test performed in the laboratory?

Accepted Answer

A method to assess bacterial susceptibility to antibiotics using zones of inhibition.

Question 6

Which of the following statements about viruses is correct?

Accepted Answer

Viruses require a host cell to replicate.

Question 7

Which of the following is an example of a specific immune response?

Accepted Answer

Production of antibodies against the measles virus after vaccination.

Question 8

A laboratory technician is using a binocular microscope to identify microorganisms. Which adjustment is most critical for achieving a clear image at high magnification?

Accepted Answer

Using immersion oil with the 100x objective lens.

Question 9

Which of the following best explains why handwashing is emphasized in the microbiology laboratory?

Accepted Answer

To prevent the transmission of infectious agents and reduce contamination.

Question 10

Which of the following is a correct application of scientific nomenclature in microbiology?

Accepted Answer

Italicizing both the genus and species names, with the genus capitalized and the species lowercase.

Question 11

A patient is diagnosed with E. coli O157:H7 infection after eating contaminated food. Which of the following best describes the mode of transmission?

Accepted Answer

Fecal-oral transmission.

Question 12

Which of the following laboratory techniques is used to isolate a pure bacterial colony from a mixed culture?

Accepted Answer

Streak dilution method.

Question 13

Which of the following is a distinguishing feature of prokaryotic cells compared to eukaryotic cells?

Accepted Answer

Lack of a true nucleus.

Question 14

Which of the following best describes the principle behind the use of selective media in microbiology?

Accepted Answer

To inhibit the growth of certain microbes while allowing others to grow.

Question 15

A patient with AIDS is more susceptible to opportunistic infections. Which of the following best explains this increased susceptibility?

Accepted Answer

Suppression of the immune system, particularly T helper cells.

Question 16

Which of the following equations correctly represents the calculation of bacterial generation time ($$g) $$given the number of generations ($$n) $$and total time ($$t$$)?

Accepted Answer

$$g = \frac{t}{n}$$

Question 17

Which of the following is the most effective method for sterilizing heat-sensitive laboratory media?

Accepted Answer

Filtration using a membrane filter.

Question 18

A laboratory report requires the use of the scientific method. Which of the following steps should be performed first?

Accepted Answer

Making observations and identifying a problem.

Question 19

Which of the following best describes the role of vaccines in immunology?

Accepted Answer

Vaccines stimulate the immune system to produce a specific response and memory cells.

Question 20

A patient develops a rash after taking penicillin. Which type of hypersensitivity reaction is most likely involved?

Accepted Answer

Type I (immediate) hypersensitivity.

BIO140 Microbiology & Immunology: Course Overview and Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards