MCQs Mock Test for Lab Technicians and Technologists: Chapter 32

A local day care center has several simultaneous cases of diarrhea. A methylene blue fecal smear was taken during the outbreak from one of the children and revealed numerous PMN’s and occult blood. Culture of the stool revealed a typical gram negative rod which fermented glucose but not lactose, was nonmotile and did not produce H2S. The agent which MAY have caused this outbreak was

Which of the following events is MOST likely to be due to bacterial conjugation?

Diarrhea associated with prolonged antibiotic treatment, including pseudomembranous colitis, is MOST FREQUENTLY caused by

Each of the following statements concerning Mycobacterium tuberculosis is correct EXCEPT:

A specimen suspected of containing members of the Enterobacteriaceae was subjected to a few laboratory diagnostic tests and generated the following results: Gram negative rod; colorless/pale colonies on MacConkey agar. All of the following microorganisms may be included in the diagnosis, EXCEPT

A family has a diarrhea after eating raw shellfish due to an oxidase positive, gram-negative curved bacillus that requires a special media for growth. Which of the following is the most likely cause?

Which type of genetic exchange in bacteria is susceptible to the activity of deoxyribonuclease?

Hybridomas are formed by fusing antibody-producing white blood cells with:

Which of the following stains is used to classify microorganisms based on their cell wall content?

The process by which bacterial or plasmid DNA may be mistakenly incorporated (during assembly) into one phage being produced by the lytic life cycle and then that DNA-transferred to another bacterial cell which may acquire some new genetic traits is called

The presence of a capsule around bacterial cells usually indicates their increased disease-causing potential and resistance to disinfection. Capsules are generally viewed by:

Which of the following statements is most correct about the differential Gram stain?

In light microscopes, what function does a condenser serve?

The order of reagents used in the Gram stain are:

All of the following are examples of special stains except:

Your patient is a 30-year-old woman with nonbloody diarrhea for the past 14 hours. Which one of the following organisms is LEAST likely to cause this illness?

Which of the following mechanisms is most likely to be involved in multiple drug resistance transfer from one cell to another?

The formation of a mating pair during the process of conjugation in Escherichia coli requires

Which one of the following bacteria has the LOWEST 50% infectious dose (ID50)?

The total magnification of a microscope is calculated by:

The pathogenesis of which one of the following organisms is MOST likely to involve invasion of the intestinal mucosa?

The ability of a cell to bind DNA to its surface and import it is required for which genetic process?

For which one of the following enteric illnesses is a chronic carrier state MOST likely to develop?

Transmission electron microscopy is best for high magnification viewing of

What type of microscopy allows for the visualization of internal components within live, unstained specimens?

Two hours after a delicious Thanksgiving dinner of barley soup, roast turkey, stuffing, sweet potato, green beans, cranberry sauce, and pumpkin pie topped with whipped cream, the Smith family of four experience vomiting and diarrhea. Which one of the following organisms is MOST likely to cause these symptoms?

Each of the following agents is a recognized cause of diarrhea EXCEPT:

The form of genetic exchange in which donor DNA is introduced to the recipient by a bacterial virus is

Drumstick appearance in the microscopy is the distinguishing characteristics of:

Which one of the following processes involves a sex pilus?

Which of the following pathogenic bacteria is MOST COMMONLY associated with traveler’s diarrhea?

A 29-year-old man with a long history of heartburn and dyspepsia presents to the primary care doctor with severe mid-epigastric pain. He was initially treated with an H2 blocker twice a day. He immediately had relief but his symptoms returned after two weeks. What is the most likely cause for the relapse in his symptoms?

Conjugation with a cell with chromosomal drug resistance appears in the genome of a bacteriophage that has infected it.

Which one of the following organisms that infects the gastrointestinal tract is the MOST frequent cause of bacteremia?

Which of the following is defined as the ability to distinguish or separate two adjacent objects or points from one another in a microscopic specimen?

The first vaccine for human use produced using recombinant DNA technology was the:

Following specialized transduction, if any of the bacterial genes transferred in are to be stabilized, what process must occur?

Which genetic material is found in pathogenic Corynebacterium diphtheriae but not in nonpathogenic normal flora diphtheroids?

A 27-year-old IV drug user presents with difficulty swallowing. Examination of the oropharynx reveals white plaques along the tongue and the oral mucosa. Which of the following best describes the microscopic appearance of the microorganism responsible for this patient’s illness?

Which of the following microscopic techniques provide three-dimensional images of a bacterial cell?

The compound light microscope can be used to observe:

Which of the following events is most likely due to bacterial transformation?

A 25-year-old female medical student reports that she had lunch at a Indian restaurant in the afternoon. She is presented in the emergency department of hospital with the complaints of abdominal cramps, nausea and vomiting. Culture and gram stain reveal gram- positive aerobic rods. Which of the following is the most likely cause of this infection?

A 26-year-old male with AIDS presents with painful bloody diarrhea. Stool culture on MacConkey agar medium and subsequent analyses reveals predominantly a gram -negative facultative anaerobic rod, which is oxidase negative, lactose negative, H2S negative and non-motile. Which of the following is the most likely cause of this infection?

The following organisms are recognized causes of diarrhea EXCEPT

How is a prophage created?

Which of the following statements concerning recombinant DNA technology is false?

Five hours after eating reheated rice at a restaurant, a 24-year-old woman and her husband both developed nausea, vomiting, and diarrhea. Which one of the following organisms is the MOST likely to be involved?

Which one of the following host defense mechanisms is the MOST important for preventing dysentery caused by Salmonella?

A 70-year-old man underwent bowel surgery for colon cancer 3 days ago. He now has a fever and abdominal pain. Attending physician is concerned that he may have peritonitis. Which one of the following pairs of organisms is MOST likely to be the cause?