F8 Flashcards
Which of the following describes the hemolytic pattern of E. rhusiopathiae?
Beta hemolysis
Double zone of alpha hemolysis
None of the choices
Partial hemolysis
Variable zone of alpha hemolysis
-Variable zone of alpha hemolysis
Decipher the statements and choose the correct answer among the choices:
I. C. diphtheriae is CTBA halo positive
II. C ulcerans is Esculin hydrolysis positive and urease negative
III. C. urealyticum is gelatinase positive
IV. C. pseudodiphthericum is nitrate production positive and urease positive
V. All the statements are False
Statements II, III & IV are False
Statement V is true
Statements I, III & IV are True
Statements III, IV & V are False
Statements & IV are True
-Statements I & IV are True
Which among the choices is the structure formed by streptomyces that bears chains of spores at maturity?
None of the choices
Mycelium
Hyphae
Muramic acid
Colonies
-Mycelium
Which of the following is true regarding B. cereus?
None of the choices
Spores are rectangular and swell from the mother cells
Spores germinate on reheated fried rice
Enterotoxin is similar to that of shiga toxin
Portal of entry is via the GUT
-Spores germinate on reheated fried rice
Which among the choices describes your C. perfringens?
Causes stormy fermentation in Lactose Agar Media
None of the choices
Shows variable zone of alpha hemolysis in BAP
Produces a sour odor in RCM broth
Alpha toxin shows narrow zone of hemolysis
-Produces a sour odor in RCM broth
Decipher the statements and choose the correct answer among the choices:
I. Opacity is the positive nagler reaction
II. B. anthracis resembles locks of matted hair in BAP
III. C. perfringens type A is most common cause of necrotizing enteritis
IV. C. botulinum type C is known to cause shock and peritonitis
V. C. botulinum is known to causes paralysis due to food poisoning
Statements I, II & V are True
Statements III, IV & V are False
Statements II, IV & V are False
Statements II, III & IV are False
Statements I, II & III are True
-Statements II, III & IV are False
Which of the following is true regarding Clostridium species?
Swollen and small appearance
Normal flora of GIT in humans and animals
Harmless saprophytes in the soil, linen and toiletries
None of the choices
Most species are microaerophilic and aerotolerant
-Normal flora of GIT in humans and animals
Which of the following describes Kurthia growth on yeast nutrient agar?
Chalky appearance
Medusa head appearance
Shredded butter appearance
None of the choices
Bird’s feather appearance
-Medusa head appearance
Which among the choices is known to produce aroma of wet dirt?
None of the choices
Nocardia
Actinomycetes
Actinomyces
Streptomyces
-Nocardia
Which of the following is false regarding B. cereus?
None of the choices
Grows on 5% Sheep blood agar and CAP
Alpha hemolytic and produces irregular perimeters
Multiplex PCR is used to detect genes for enterotoxins
Microslide gel diffusion test is used as a toxin detection system
-Alpha hemolytic and produces irregular perimeters
Decipher the statements and choose the correct answer among the choices:
I. Latex agglutination test for C. difficile detects Lactate dehydrogenase
II. Toxin B is a cytotoxin known to cause intestinal tissue death
III. Stool cultures are often used in detection of B. anthracis eschar
IV. Subunit B of C. botulinum prevents neurotoxin from being inactivated
V. Botulinum toxin is heat resistant
VI. C. tetani produces black colonies on meat in RCM
Statements II, III & IV are True
Statements III, V & VI are False
Statements I, III & V are False
Statements IV, V & Vlore False
Statements II, V & VI are True
-Statements I, III & V are False
Which of the following is true regarding B. anthracis?
None of the choices
Capsule is made up of D-glutamate
Anthrax toxin is made up of 5 types of exotoxins
Gram positive rod with square ends found in pairs
Humans are commonly infected thru inhalation
-Capsule is made up of D- glutamate
Which among the choices is correct regarding spore characteristics of clostridia?
C. tetani produces eyepiece shaped spores
C. bifermentans produces spindle shaped spores
C. perfringens produces drum stick shaped spores
C. tertium produces club shaped spores
None of the choices
-C. bifermentans produces spindle shaped spores
Which arcanobacterium is known to be common in rural environments?
A. bernardiae
None of the choices
A. pyogenes
A. haemolyticum
A. gibsonii
-A. pyogenes
Which of the following is false regarding B. anthracis?
Can cause meningitis
Gram stain is used as a presumptive identification
None of the choices
Produces a white yellowish lesion known as the eschar
Medusa head appearance on nutrient agar
-Produces a white yellowish lesion known as the eschar
