Microbiology MCQs Mock Test – Chapter 57

Each of the following statements concerning the mechanisms of resistance to antimicrobial drugs is correct EXCEPT:

Which one of the following statements concerning the organisms that cause brucellosis is CORRECT?

Sixteen residents in a retirement home have fever, malaise, and anorexia. These residents have taken their meals prepared by the same kitchen. Blood cultures from of these residents grow Salmonella enterica subsp. typhi. The primary reservoir of this organism is

Each of the following statements concerning spirochetes is correct EXCEPT:

Each of the following statements concerning Histoplasma capsulatum is correct EXCEPT:

Each of the following statements about both measles virus and rubella virus is correct EXCEPT:

Each of the following statements concerning epidemic typhus is correct EXCEPT:

Regarding the serologic diagnosis of infectious mononucleosis, which one of the following is CORRECT?

Each of the following statements concerning sleeping sickness is correct EXCEPT:

A 28-year-old woman with a previous history of rheumatic fever now has a fever for the past 2 weeks. Physical examination reveals a new heart murmur. You suspect endocarditis and do a blood culture, which grows a viridans group streptococcus later identified as Streptococcus sanguis. Of the following body sites, which one is the MOST likely source of this organism?

Regarding Lyme disease, which one of the following is MOST accurate?

Each of the following statements concerning Q fever is correct EXCEPT:

In the U.S., a baby has the greatest chance of acquiring which virus in utero?

Which one of the following viruses possesses a genome of single-stranded RNA that is infectious when purified?

A 33-year-old man presents to the emergency department with a fever of 102.5°F, facial palsy, headache, and malaise. A circular maculopapular rash was identified on the patients left shoulder; the patient was unaware of the rash. The patient likely acquired the above infection via which of the following routes?

A 70-year-old woman is brought to the emergency department by her spouse with complaints of shortness of breath and fever. Physical examination revealed a fever of 103°F, hypotension, and a diastolic murmur. History revealed a cardiac valve replacement 5 years earlier. Three consecutive blood cultures taken during febrile periods revealed gram-positive cocci that were catalase-positive and coagulase-negative. Which of the following organisms is the most likely cause?

Each of the following statements concerning the antigenicity of influenza A virus is correct EXCEPT:

Which one of the following organisms principally infects vascular endothelial cells?

Each of the following statements concerning Rocky Mountain spotted fever is correct EXCEPT:

A 55-year-old woman had her rheumatic heart valve replaced with a prosthetic valve. Six blood cultures became positive after 3 days of incubation. An optochin- resistant, catalase-negative gram-positive coccus that was alpha-hemolytic was isolated. What was the most likely causal agent?

Your patient has subacute bacterial endocarditis caused by a member of the viridans group of streptococci. Which one of the following sites is MOST likely to be the source of the organism?

Ticks are vectors for the transmission of each of the following diseases EXCEPT:

Each of the following statements concerning the mechanism of action of antibacterial drugs is correct EXCEPT:

Which of the following statements concerning antigenic drift in influenza viruses is correct?

Viruses are obligate intracellular parasites. Each of the following statements concerning this fact is correct EXCEPT:

Which one of the following zoonotic illnesses has NO arthropod vector?

Each of the following statements concerning fungi and protozoa is correct EXCEPT:

An 11 -month-old infant was brought to the emergency department with difficulty breathing and wheezing. History and physical examination reveal a slight fever, cough, and rhinorrhea that began about 2 days before. Analysis of the sputum reveals normal flora with the presence of giant multinucleated cells. Which of the following is the most likely cause?

Each of the following statements concerning viruses is correct EXCEPT:

Fungal cells that reproduce by budding are seen in the infected tissues of patients with:

Each of the following viruses possesses double-stranded nucleic acid as its genome EXCEPT:

Regarding viroids, which one of the following statements is the MOST accurate?

What organism is most likely responsible for bacterial endocarditis in men following urological instrumentation.?

A 5-year-old girl presents with a fever and a generalized macular rash that is most dense on the scalp and trunk of the body. Several waves of lesions appear, one after another, and evolve rapidly into vesicles and then pustules over several days. The most likely disease and causal agent is

An outbreak of sepsis caused by Staphylococcus aureus has occurred in the newborn nursery. You are called upon to investigate. According to your knowledge of the normal flora, what is the MOST likely source of the organism?

The use of antibiotics that inhibit or inactivate cellular ribosomes will result directly in the loss of which of the following functions:

Which one of the following statements about virion structure and assembly is CORRECT?

Which one of the following statements about genital herpes is LEAST accurate?

A 68-year-old woman on chemotherapy for leukemia has developed sepsis due to an infection with Escherichia coli . The following day the patient develops septic shock and dies. The structure on the bacterium most likely responsible for causing septic shock in this patient is

Listed below are five bacteria paired with a mode of transmission. Which one of the pairings is MOST accurate?

Each of the following statements concerning penicillin is correct EXCEPT:

Each of the following statements concerning Coccidioides immitis is correct EXCEPT:

What is the primary means of spread for measles?

Viruses enter cells by adsorbing to specific sites on the outer membrane of cells. Each of the following statements regarding this event is correct EXCEPT:

Reasonable mechanisms for viral persistence in infected individuals include all of the following EXCEPT:

A 81-year-old woman who is receiving chemotherapy for leukemia develops a fever to 40°C and has two episodes of teeth-chattering chills, and her blood pressure drops to 80/20 mmHg. Of the following factors, which one is MOST likely to be the cause of her fever, chills, and hypotension?

A 33-year-old HIV-positive man complains of headache and blurred vision. Physical examination reveals papilledema and ataxia. A head CT scan is normal, but CSF obtained by lumbar puncture reveals encapsulated organisms visible by India ink. Which of the following is true concerning this organism?

Each of the following statements concerning retroviruses is correct EXCEPT:

Each of the following statements regarding these viruses is correct EXCEPT:

An obese 32-year-old diabetic woman presents with complaint of red and painful skin in her abdominal skin folds. Examination reveals a creamy white material at the base of the fold. It is erythematous underneath and extends beyond the creamy material. Microscopic examination of the exudate reveals oval budding structures (3 X 6 µm) mixed with more budding elongated forms. The most likely causal agent is?