Microbiology MCQs Mock Test – Chapter 54

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

Fungi are commonly identified on their basis of their

A 30-year-old woman presents to her gynecologist with complaints of vaginal itching and a frothy, yellow discharge. She also complains of painful urination. She admits to being sexually active with several men in the past two weeks. Cultures are negative for bacterial growth, but organisms are visible via a wet preparation on low power. The most likely causal agent is

The order of reagents used in the Gram stain are:

Each of the following statements concerning Chlamydia trachomatis is correct EXCEPT:

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

The agar recommended for antibiotic sensitivity testing is :

The organism that can cause rheumatic fever and/or glomerular nephritis is

Negative staining is useful for observing the presence of ..

Regarding Chlamydiae, which one of the following is MOST accurate?

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

The organism that can cause rheumatic fever and/or glomerular nephritis is

Which of these is more complex than viruses?

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?

Each of the following statements concerning chlamydial genital tract infections 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

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

Several pathogens are transmitted either during gestation or at birth. Which one of the following is LEAST likely to be transmitted at these times?

Cocci arranged in packets of eight :

Which of the following statements about Transmission Electron Microscopy is not true.

Regarding the Gram stain, which one of the following is the MOST accurate?

The etiologic agent of chancroid is

Strepococcus pneumoniae

Fungi are commonly identified on their basis of their

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

Which of the following is a strict anaerobe?

Each of the following statements concerning gonorrhea is correct EXCEPT:

A 20-year-old woman presents with a history of vaginal discharge for the past 3 days. On pelvic examination, you see a mucopurulent exudate at the cervical os, and there is tenderness on palpation of the right fallopian tube. You do a Gram stain and culture on the cervical discharge. The culture is done on Thayer-Martin medium. Of the following, which findings are the MOST likely to be found?

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?

According to the Lancefield scheme of classifying the Streptococcus species, the neterococci are placed in group

Bordet-Gengou and Eugon agar base with fresh blood is used for the isolation of

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?

Which one fo the following test differentiates Staphylococcus aureus from other types of staphlococci?

Each of the following statements concerning neisseriae is correct EXCEPT:

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 these is not a viral disease?

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?

Methyl red test is used to detect :

Each of the following statements concerning chlamydiae is correct EXCEPT:

The etiologic agent of chancroid is

A variety of media may be safely stored for months is care is taken to

Drumstick appearance in the microscopy is the distinguishing characteristics of:

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?

Each of the following is associated with the Lancefield group B streptococci (S. agalactiae) EXCEPT:

Safranin in a Gram stain is used as a

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

Each of the following statements concerning Actinomyces and Nocardia is correct EXCEPT:

Strepococcus pneumoniae

Which organisms are described as minute, very plemorphic, sometimes coccobacillary, gram-negative rods that must have media enriched with X and V factors?

Bordet-Gengou and Eugon agar base with fresh blood is used for the isolation of