F6

Question 1

Decipher the statements and choose the correct answer among the choices
I. Group D streptococcus is an indicator of colon cancer
II. S. aureus have clumping factor and protein A on surface
III. Streptococcus species grows at 15% NaCl
IV. S. aureus is penicillin sensitive
V. Micrococcus is urease negative
Statements III, IV & V are False
Statements I, II & III are False
Statements I, III & V are False
None of the choices
Statements II, III & V are True

Answer 1

-Statements III, IV & V are False

Question 2

Which of the following choices is TRUE regarding Streptolysin O?
-Non-Antigenic
-None of the choices
-Sub-surface hemolysis
-Lyses WBC
-Oxygen Stable

Answer 2

-Sub – surface hemolysis

Question 3

Which of the following choices is correct regarding Major extracellular enzymes of S. pyogenes?
-M protein helps bacterial cell bind to kidney epithelia cells
-None of the choices
-Streptokinase forms clotting at site of injury
-Streptodornase hydrolyzes RNA and proteins
-Hyaluronidase breaks down connective tissue

Answer 3

-Hyaluronidase breaks down connective tissue

Question 4

Which of the following tests is S. aureus known to be negative?
Catalase and Coagulase
Mannitol fermentation test
None of the choices
PRY and Ornithine
DNAse test

Answer 4

-PRY and Ornithine

Question 5

Which of the following staphylococcus species is known to live near the sweat glands?
S. epidermidis
S. hominis
S. saprophyticus
None of the choices
S. capitis

Answer 5

-S. hominis

Question 6

Which of the following is a negative test for Micrococcus?
Glucose fermentation
Urease
Catalase
None of the choices
Modified Oxidase test

Answer 6

-Glucose fermentation

Question 7

Which of the following test can differentiate S. pneumoniae from Viridans strep?
None of the choices
Urease test
Optochin susceptibility
Bacitracin susceptibility
BAP hemolytic pattern

Answer 7

-Optochin susceptibility

Question 8

Which of the following is credited with the discovery of Micrococcus luteus?
Louis Pasteur
Martinus Beijerinck
None of the choices
Sergei Winogradsky
Alexander Fleming

Answer 8

-Alexander Fleming

Question 9

Which test can differentiate S. aureus from M. luteus?
Coagulase
Catalase
None of the choices
PYR
Mannitol Fermentation test

Answer 9

-Coagulase

Question 10

Which of the following staphylococcus is known to have a variable Novobiocin susceptibility result?
S. saprophyticus
Ş. epidermidis
S. intermedius
S. aureus

Answer 10

-S. intermedius

Question 11

Decipher the statements and choose the correct answer among the choices
I. Coagulase and Catalase positive, novobiocin sensitive is indicative of S. aureus
II. Creamy zones of B hemolytic colonies and Hippurate positive is indicative of S. agalactiae
III. Yellow colonies in MSA, Catalase negative and grows at 15% NaCl is indicative of S. aureus
IV. Optochin sensitive, Bile solubility positive, Bile esculin positive is indicative of Strep viridans
Statements I & III are False
Statements I, III & IV are True
Statements I & II are False
Statements I, II & IV are True
None of the choices

Answer 11

-Statements I & III are False

Question 12

Which of the following does not belong to the strep viridans groups?
S. mitis
None of the choices
S. salivarius
S. mutans
S. sanguine

Answer 12

-S. sanguine

Question 13

Which of the following choices is TRUE regarding S. pyogenes?
Virulence factors include hemolysins and leukogenic toxins
None of the choices
Inhabits the throat nasopharynx and skin of humans
Produces round and opaque whitish opaque colonies
Contains large amounts of lipopolysaccharides in its cell

Answer 13

-Inhabits the throat nasopharynx and skin of humans

Question 14

Which of the following is a localized cutaneous infection of S. aureus?
Toxic Shocked Syndrome
Impetigo
None of the choices
Bacteremia
Chill bed fever or puerperal sepsis

Answer 14

-Impetigo

Question 15

Which of the following is true regarding S. agalactiae?
Prevalent cause of neonatal pneumonia sepsis and meningitis in South East Asia
None of the choices
Normal flora of the ears and known to cause otitis externa
Hippurate and CAMP test positive
Produces large, butyrous zones of beta hemolysis

Answer 15

-Hippurate and CAMP test positive

Question 16

Decipher the statements and choose the correct answer among the choices
I. Erythrogenic toxins are able to damage blood vessel above the skin
II. Streptolysin O affects WBC and myocadial cells
III. Capsule of S. pyogenes is made up of M – protein
IV. Lipoteichoic acid contributes to destruction of epithelia cells
V. Necrotizing fasciitis is a flash eating disease
Statements III, IV & V are True
Statements I & II are False
Statements I, III & V are True
Statements I & IV are False
None of the choices

Answer 16

-Statements I & IV are False

Question 17

Which of the following is a gamma hemolytic streptococcus?
None of the choices
S. agalactiae
E. faecium
S. pyogenes
Viridans strep

Answer 17

E. faecium

Question 18

Which of the following describes the growth characteristics of S. aureus?

Answer 18

Pinhead colonies

Question 19

Decipher the statements and choose the correct answer among the choices
I. CAMP test positive is seen in S. agalactiae
II. S. pyogenes is bacitracin sensitive
III. >12 mm diameters in optochin test are indicative of sensitive to the antibiotic
IV. S. pneumoniae is Bile soluble test positive
V. S. pneumoniae appears as bullet shaped gamma hemolytic cocci
None of the choices
Statements III, IV & V are False.
Statements I, II & IV are True
Statement IV & V are False
Statements II, IV & V are True

Answer 19

-Statements I, II & IV are True

Question 20

Which of the following is known characteristic of Staphylococcus species?
Non-motile about 1um in diameter
Non encapsulated and common inhabitant of the lungs
Non - motile about 3um in diameter
Strict aerobe
None of the choices

Answer 20

-Non – motile about 1um in diameter