Atypical bacteria

Question 1

Belong to the class Mollicutes which means ―”soft”

Answer 1

MYCOPLASMA

Question 2

Mollicutes appear to have evolved from clostridia-loke cells of the gram-positive branch of the
eubacterial tree

Answer 2

MYCOPLASMA

Question 3

Smallest known free-living forms capable of growing on artificial media
- They have small cell size (0.3 – 0.8 um) and small genome size

Answer 3

MYCOPLASMA

Question 4

Pleomorphic organisms that do not possess cell wall slow grower, fastidious, facultatively
anaerobic, replicate by binary fission

Answer 4

MYCOPLASMA

Question 5

bic, replicate by binary fission
o These organisms are bound by a tri-layered membrane that is responsible for
 Absolute insensitivity to penicillins
 Failure to react with organic dyes used in many stains

Answer 5

MYCOPLASMA

Question 6

They require sterols for membrane function and growth

Answer 6

MYCOPLASMA

Question 7

Part of the microbial flora of humans and found mainly in the oropharynx, URT, and
genitourinary tract

Answer 7

MYCOPLASMA

Question 8

They are common parasites of the genital tract and their transmission is related to sexual
activity

Answer 8

MYCOPLASMA

Question 9

They lack the enzymatic pathway for purine and pyrimidine synthesis – require complex media

Answer 9

MYCOPLASMA

Question 10

Eaton agent
- Etiologic agent of primary atypical pneumonia (PAP)/ Walking pneumonia

Answer 10

Mycoplasma pneumoniae

Question 11

• Pleuropneumonia-like organism (PPLO)

Answer 11

Mycoplasma pneumoniae

Question 12

Doe not occur as a normal commensal
- Primarily a respiratory tract pathogen and extremely fastidious

Answer 12

Mycoplasma pneumoniae

Question 13

Can occur singly or as outbreaks in closed populations such as families and military recruit
camps, also causes tracheobronchitis
- This organism infects children and adults and is spread by respiratory droplets produced by
coughing

Answer 13

Mycoplasma pneumoniae

Question 14

A surface parasite – colonizes the mucosa of the respiratory tract

Answer 14

Mycoplasma pneumoniae

Question 15

It has gliding motility which allows penetration of organism through respiratory secretions

Answer 15

Mycoplasma pneumoniae

Question 16

responsible for attachment and interacts with neuraminic acid-containing
glycoproteins

Answer 16

P1 protein

Question 17

• they produce hydrogen peroxide and ammonia as waster products, and damage respiratory and
  urogenital epithelial system

Answer 17

Mycoplasma pneumoniae

Question 17

• they produce hydrogen peroxide and ammonia as waster products, and damage respiratory and
  urogenital epithelial system

Answer 17

Mycoplasma pneumoniae

Question 18

venereal transmission causing non-gonococcal urethritis
o has been linked to amnionitis, fetal wastage and congenital pneumonia

Answer 18

Ureaplasma urealyticum

Question 19

the T-strain of the mycoplasma (tiny)
o It has the ability to metabolize urea – produces urease which is considered to be unique
for the mycoplasmas
o When grown in the presence of manganous sulfate with 1% urea, they will develop
minute golden brown colonies

Answer 19

Ureaplasma urealyticum

Question 19

the T-strain of the mycoplasma (tiny)
o It has the ability to metabolize urea – produces urease which is considered to be unique
for the mycoplasmas
o When grown in the presence of manganous sulfate with 1% urea, they will develop
minute golden brown colonies

Answer 19

Ureaplasma urealyticum

Question 20

Genital mycoplasma
- They cause invasive disease in immunosuppressed patients (agammaglobulinemia), prostatitis,
bacterial vaginosis, non-gonococcal urethritis (NGU)

Answer 20

Ureaplasma urealyticum and Mycoplasma hominis

Question 21

The AIDS associated mycoplasma where the organism my play a role, possibly a second
invader

Answer 21

Mycoplasma incognitus

Question 22

“dark brownish clumps”

Answer 22

A7 to A8 agar medium;U. urealyticum

Question 23

“fried egg colonies”

Answer 23

M. pneumoniae

Question 24

urease (-); colonies can be stained with the Dienes or Acridine orange

Answer 24

M. hominis

Question 25

e can be incorporated int media to detect U. urealyticum and M.
hominis

Answer 25

Urea and/or arginine

Question 26

Rapid identification for Ureaplasma urealyticum

Answer 26

Manganous chloride test