Microbiology Test: Questions And Answers

29 Questions | By Themes | Updated: Mar 21, 2022 | Attempts: 823

Questions

Settings

Feeling competitive? Check out our online microbiology test questions and answers to prepare for an upcoming exam, stay updated or even get insights into creating awesome quiz questions.

Questions and Answers

1.

The PAP test is useful in the diagnostics of infections caused by:
- A.
  
  Hepatitis C
- B.
  
  Hepatits B
- C.
  
  Molluscum contagiosum virus
- D.
  
  Human papilloma virus
- E.
  
  Herpes virus
2.

Debridement, penicillin G, clindamycin, metronidazole, and hyperbaric oxygen may be used in the treatment of infections caused by:
- A.
  
  Clostridium perfringens
- B.
  
  Streptococcus pneumoniae
- C.
  
  Streptococcus pyogenes
- D.
  
  Staphylococcus epidermidis
- E.
  
  Mycobacterium tuberculosis
3.

Common cold is most often caused by:
- A.
  
  Rhinovirus
- B.
  
  Sars-Cov-1
- C.
  
  Sars-coV-2
- D.
  
  Influenza virus
- E.
  
  Streptococcus pyogenese
4.

Which of the following toxins causes vascular damage in the colon, kidneys, and central nervous system, what may result in hemorrhagic colitis or more severe conditions such as a hemolytic uremic syndrome?
- A.
  
  Shiga toxin
- B.
  
  Vacuolating cytotoxin VacA
- C.
  
  Enterotoxin from Staphylococcus aureus
- D.
  
  Listeriolysin O
- E.
  
  Cereulide
5.

A 46-year-old sexually active woman is suffering from an infection caused by long spiral bacteria. Point at the most probable species:
- A.
  
  Mycoplasma hominis
- B.
  
  Streptococcus agalactiae
- C.
  
  Haemophilus ducreyi
- D.
  
  Treponema pallidum
- E.
  
  Chlamydia tranchomatis
6.

Which of the following UTI pathogens often leads to kidney stones formation?
- A.
  
  Klebsiella pneumoniae
- B.
  
  Acintobacter baumannii
- C.
  
  Pseudomonas aeruginosa
- D.
  
  Staphylococcus saprophyticus
- E.
  
  Proteus mirabillis
- F.
  
  Enterococcus faecalis
7.

A 49-year-old man was hospitalized because of a high fever, most probably related to large wounds localized on his left leg. He suffered from diabetes mellitus, during his hospital stay the wounds were cleaned and a swab was taken. The culture was positive for Acinetobacter baumannii, bacteria that are:
- A.
  
  Gram-negative rods
- B.
  
  Sensitive to cephalosporins
- C.
  
  Thermophilic
- D.
  
  Strictly anaerobic
- E.
  
  Coagulase-positive
8.

A 22-year-old reported fever and headache, paroxysms of stabbing pain in the muscles of the chest and abdomen. The slightest movement of the rib cage caused a sharp increase of pain, which makes it very difficult to breathe. He was diagnoses with Bornholm disease caused by Coxsackie B virus, the pathogen that contains:
- A.
  
  DsDNA
- B.
  
  SsDNA
- C.
  
  Nucleoid
- D.
  
  RNA
- E.
  
  Plasmids
9.

Point at the virulence factor playing an important role In the pathogenesis of infections caused by S.aures:
- A.
  
  Streptolysin
- B.
  
  Listeriolisn
- C.
  
  Beta-haemolysin
- D.
  
  LPS
- E.
  
  Shiga toxin
10.

If the TPHA test confirms the suspected infection, the following disease has developed:
- A.
  
  Syphillis
- B.
  
  Chancre
- C.
  
  Chancroid
- D.
  
  Gonorrhea
- E.
  
  Herpangina
11.

Which of the following species is the common cause of bacterial gastroenteritis and is considered as a major triggering agent of Guillain-Barre Syndrome (GBS)?
- A.
  
  Campylobacter jejuni
- B.
  
  Escherichia coli
- C.
  
  Shigella sonnei
- D.
  
  Salmonella Enteritidis
- E.
  
  Salmonella typhi
- F.
  
  Listeria monocytogenes
- G.
  
  Clostridium perfringens
12.

The surgical wound of a 48-year-old patient worsened, pus appeared, cellulitis was observed. Culture of a swab revealed small colonies on Coccosel agar. Under the microscope Gram(+) cocci were observed, Sensitivity tests revealed that they were VRE and HLAR. Infection may be treated with:
- A.
  
  Linezolid
- B.
  
  Vancomycin
- C.
  
  Teicoplanin
- D.
  
  Streptomycin
- E.
  
  Gentamicin
13.

Which of the following diarrheagenic pathotypes of E.coli caused diarrhea by producing heat-stable (LT) and /or heat-stable (ST) enterotoxins, which are plasmid-encoded?
- A.
  
  EPEC
- B.
  
  EHEC
- C.
  
  EIEC
- D.
  
  ETEC
- E.
  
  EAEC
14.

A 63-year-old man noticed that he has significant weight loss in about 2 months of time. he reported abdominal pain, episodes of diarrhea, and cough in the last weeks. Culture of sputum revealed the presence of acid-fast bacteria so the treatment should last for:
- A.
  
  6 months
- B.
  
  24 months
- C.
  
  1 week
- D.
  
  2 weeks
- E.
  
  4 weeks
15.

A 67-year-old man was diagnosed with pneumonia. Alpha-haemolytic and optochin-sensitive bacteria were isolated, under the microscope you most likely see:
- A.
  
  Gram-postive diplococci
- B.
  
  Gram-positive rods
- C.
  
  Gram-negative diplococci
- D.
  
  Gram-negative rods
- E.
  
  Spirochetes
16.

Gonorrhea is most often asymptomatic in:
- A.
  
  Women
- B.
  
  Newborns
- C.
  
  Infants
- D.
  
  Preschool children
- E.
  
  Men
17.

Which of the following diarrheagenic pathotypes of E.coli colonizes intestinal mucosa via aggregative adherence fimbriae (AAF), formulates mucoid biofilm, and elaborates various enterotoxins and cytotoxins?
- A.
  
  ETEC
- B.
  
  EAEC
- C.
  
  EHEC
- D.
  
  EPEC
- E.
  
  EIEC
18.

A make infant has been delivered prematurely. The boy became septic two days after the birth. The infant's blood culture revealed Gram(+), catalase (-) cocci. The mother's vaginal-rectal swab culture showed glistening grey-white colonies with a narrow zone of beta-hemolysin on Columbia Agar. Which of the following is the most likely cause of the infant's infections?
- A.
  
  Streptococcus agalactiae
- B.
  
  Streptococcus pyogenes
- C.
  
  Streptococcus dysgalactiae
- D.
  
  Streptococcus pneumoniae
19.

A female student is admitted to the emergency with symptoms of a severe UTI. Gram-negative. facultative anaerobic, motile, lactose-positive rods have been isolated from the middle-stream urine sample. Point at the most causative agent of this infections:
- A.
  
  Serratia marcescens
- B.
  
  Enterobacter cloacae
- C.
  
  Escherichia coli
- D.
  
  Klebsiella pneumoniae
- E.
  
  Citrobacter freundii
20.

A 27-year-old women is suffering from a sexually transmitted bacterial infection caused by the obligatory intracellular parasite. which of the following treatment may be administered?
- A.
  
  Carbapenems
- B.
  
  Penicillins
- C.
  
  Glycopeptides
- D.
  
  Cephalosporins
- E.
  
  Tetracyclines
21.

A 3-year-old failed to thrive, lost weight, complaining about abdominal pain. The mother reported that her son had episodes of diarrhea and cough. The sputum culture revealed the presence of acid-fast bacteria, the cell wall of which contains:
- A.
  
  Sulfatides
- B.
  
  Lipid A
- C.
  
  Antigen H
- D.
  
  Antigen 0
- E.
  
  Protein A
22.

If the female newborn presents with infectious conjunctivitis, her mother most probably suffers from:
- A.
  
  Gonorrhea
- B.
  
  Meningococcemia
- C.
  
  Bacterial vaginosis
- D.
  
  Syphills
- E.
  
  GBS pneumonia
23.

A 56-year-old man is admitted to the emergency with left flank pain (pain in the lumbar region). A CAT scan is being ordered along with a urinalysis and microbiological culture. A CAT scan shows two kidney stones. Urinalysis is positive for blood, nitrites, and bacteria in the urine. Microbiological culture shows Gram-negative lactose-negative rods, Point at the most likely pathogen:
- A.
  
  Proteus penneri
- B.
  
  Acinetobacter baumannii
- C.
  
  Pseudomonas aeruhinosa
- D.
  
  Morganella morganii
24.

The burn wound of the 22-year-old patient worsened, blue-green pus appeared, cellulitis was observed. The culture of a swab revealed Jasmin smelling of the greenish colonies. Gram-negative rods were observed under the light microscope. The most likely species was:
- A.
  
  Pseudomonas aeruginosa
- B.
  
  Acinetobacter baumannii
- C.
  
  Escherichia coli
- D.
  
  Legionella pneumophlia
- E.
  
  Bacteroids fragills
25.

Which of the following bacterial colonies will be large and yellow after 24 hours of incubation at 37 celsius on the Thiosulfate-Citrate-Bile Salts-Sucrose (TCBS) Agar?
- A.
  
  Vibrio cholerae colonies
- B.
  
  Campylocabacter jejuni colonies
- C.
  
  Listeria monocytogenes colonies
- D.
  
  Escherichia coli colonies
- E.
  
  Pseudomonas aeruginosa colonies
- F.
  
  Shigella sonnei colonies