$$Titer = \frac{1}{\text{highest dilution producing agglutination}}$$

Question 1

Which of the following best describes a genotypic method for identifying unknown bacteria?

Accepted Answer

Analysis of microbe’s DNA or RNA sequences

Question 2

A patient’s sputum sample is collected for tuberculosis testing. Which of the following is most critical for proper specimen collection?

Accepted Answer

Prompt transport to the lab and storage under refrigeration

Question 3

Which diagnostic method relies on the use of antibodies to detect either antigens or patient antibodies?

Accepted Answer

Immunologic method

Question 4

A dichotomous key is most useful in which of the following diagnostic approaches?

Accepted Answer

Phenotypic identification using a flowchart of observable traits

Question 5

Which of the following media types is designed to encourage the growth of only the suspected pathogen?

Accepted Answer

Selective media

Question 6

In a biochemical test, a color change indicates:

Accepted Answer

A direct enzyme-mediated metabolic reaction

Question 7

Phage typing is particularly useful for:

Accepted Answer

Tracing bacterial strains in epidemics

Question 8

Which of the following statements about specimen collection is TRUE?

Accepted Answer

Special swabs and transport systems may provide an anaerobic environment for oxygen-sensitive bacteria

Question 9

A single colony of Mycobacterium tuberculosis found in a sputum culture is:

Accepted Answer

Highly suggestive of disease

Question 10

Which of the following is a principle of serological testing?

Accepted Answer

Antigen-antibody binding can be visualized as clumps in solution under optimal concentrations

Question 11

Which equation correctly represents the calculation of an antibody titer?

Accepted Answer

$$Titer = \frac{1}{	ext{highest dilution producing agglutination}}$$

Question 12

Which of the following best describes the difference between agglutination and precipitation reactions?

Accepted Answer

Agglutination involves whole cells, while precipitation involves soluble antigens

Question 13

A lateral flow immunochromatography test is commonly used for:

Accepted Answer

Rapid point-of-care diagnosis such as pregnancy or COVID-19 tests

Question 14

Which of the following statements about specificity and sensitivity is correct?

Accepted Answer

A test with high specificity will have a low false-positive rate

Question 15

Which molecular technique uses primers to amplify specific DNA sequences for rapid microbial identification?

Accepted Answer

Polymerase Chain Reaction (PCR)

Question 16

Which of the following is TRUE regarding whole-genome sequencing in clinical labs?

Accepted Answer

It is now commonplace and allows rapid analysis of outbreaks and drug-resistant organisms

Question 17

Which diagnostic technology analyzes a protein fingerprint from patient samples using mass spectrometry?

Accepted Answer

MALDI-TOF

Question 18

A patient is suspected of having a deep-seated infection. Which imaging technology is most useful for locating the area before biopsy?

Accepted Answer

CT or PET scan

Question 19

Which of the following is a real-world application of FISH (fluorescent in situ hybridization) in clinical microbiology?

Accepted Answer

Identifying an organism directly from patient or environmental samples without culturing

Question 20

Which of the following is a key advantage of point-of-care diagnostic tests?

Accepted Answer

They allow patient care to continue without delay by providing rapid results

Diagnosing Infections: Microbial Identification and Diagnostic Methods

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