Medical Microbiology: MCQ on Mycoplasma sps




Multiple Choice of Question on Mycoplasma species
1) Which of the following are the examples of the human infections caused by Mycoplasma spp? Select from all the options given below
a) Pneumonia
b) Food poisoning
c) Urethritis
d) Skin infections

2) All of the following are the general characteristics of Mycoplasma spp, EXCEPT?
a) It can grow on cell-free media containing lipoprotein and sterol
b) The size of the bacteria can be as small as 150 to 250 nm
c) It can be identified using gram staining technique
d) The bacteria show pleomorphic motility

3) A 14-year-old boy contracts cough and fever at school where one of his friends from the class had the same symptom for a few days. At the hospital, laboratory sputum culture and gram staining method showed negative results and chest radiography results also did not demonstrate the infection area properly, which is the likely pathogen?
a) Mycoplasma hominis
b) Mycoplasma pneumoniae
c) Mycobacterium leprae
d) Ureaplasma urealyticum

4) Which of the following statements is true about Ureaplasma urealyticum?
a) It can be cultivated routine culture medium
b) It is much larger than other Mycoplasma spp and viruses
c) It requires urea for its growth
d) It is susceptible to penicillin and amoxicillin

5) Mycoplasma spp are resistant to Penicillin?
a) True
b) False

6) A blood sample from a 19-year-old sexually active woman with genital infections was taken and cultured for the isolation of the responsible pathogen. Name the least likely pathogen that can be responsible for the infection?
a) Chlamydia trachomatis
b) Mycoplasma pneumoniae
c) Mycoplasma hominis
d) Mycoplasma genitalium

7) Which of the following bacteria appear as “fried egg” types of colonies when cultured on suitable solid media?
a) Mycoplasma pneumoniae
b) Mycoplasma genitalia
c) Mycoplasma hominis
d) Ureaplasma urealyticum

8) The routine laboratory diagnostics method is usually not helpful for the isolation and identification of Mycoplasma pneumoniae. All of the following are the clinical tests for the diagnosis of the infection in humans caused by M.pneumoniae, EXCEPT?
a)ELISA
b) Complement fixation
c) Cold hemagglutinins
d) Electron microscopy

9) Which of the following cause “community-acquired pneumonia”? Select from all the options given below
a)Streptococcus pneumoniae
b)Chlamydia trachomatis
c) Mycoplasma pneumoniae
d) Haemophilus influenzae

10) Which of the following Mollicutes is associated with the infection “salpingitis” and “postpartum fever”?
a) Mycoplasma genitalium
b) Ureaplasma urealyticum
c) Mycoplasma hominis
d) Mycoplasma pneumoniae


11) Which of the following Mycoplasma spp grow rapidly in both broth and agar medium?
a) Ureaplasma urealyticum
b) Mycoplasma genitalium
c) Mycoplasma pneumoniae
d) None of the above

12) Ureaplasma urealyticum is found in sexually active men and women, about what percentage of women have it?
a) 20 to 40%
b) 40 to 80 % >
c) 5 to 20 %
d) 25 to 45%

13) Mycoplasma pneumoniae infections are most prevalent in what age range of people?
a) 15 to 60
b) 5 to 45
c) 5 to 20
d) 10 to 50

14) Which of the following statements is true regarding the pathogenesis of Mycoplasma infections?
a) Enter the host cell by releasing exotoxin
b) Adherence to the host cells is mediated by the bacterial proteins
c) Inhibited by beta-lactam antibiotics
d) All of the above

15) Which of the following is the drug of choice for Ureaplasma urealyticum infections?
a) Penicillin
b) Tetracyclines
c) Cephalosporins
d) Imipenem


Multiple Choice Answers Review
1)- a) Pneumonia, c) Urethritis
2)- c) It can be identified using gram staining technique
3)- b) Mycoplasma pneumoniae
4)- c) It requires urea for its growth
5)- a) True
6)- b) Mycoplasma pneumoniae
7)- c) Mycoplasma hominis
8)- d) Electron microscopy
9)- a) Streptococcus pneumoniae, c) Mycoplasma pneumoniae, d) Haemophilus influenzae
10)- c) Mycoplasma hominis
11)- a) Ureaplasma urealyticum
12)- b) 40 to 80 %
13)- c) 5 to 20
14)- b) Adherence to the host cells is mediated by the bacterial proteins
15)- b) Tetracyclines

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