Bacte/Histopath MRXUH Exam

Question 1

Quellung test is used to identify which strep spp.

a. S. pyogenes
b. S. agalactiae
c. S. sanguis
d. S. pneumoniae

Answer 1

d. S. pneumoniae

Question 2

The salt tolerance test (6.5%) is used for presumptive identify:

a. Group D Non-enterococci
b. Enterococci
c. Viridans
d. S. Pneumoniae

Answer 2

b. Enterococci

Question 3

The dye used to stain Mycobacterium

A. Methylene Blue
B. Carbol Fuschin
C. Crystal Violet
D. Iodine

Answer 3

B. Carbol Fuschin

Question 4

The symptoms of scarlet fever are due to

A. Streptolysin
B. Coagulase
C. Erythrogenic toxin
D. Alpha toxin

Answer 4

C. Erythrogenic toxin

Question 5

The Schultz-Charlton phenomenon refers to a lab test for suspected cases of

A. Pneumonia
B. Scarlet fever
C. Diphtheria
D. Erysipelas

Answer 5

B. Scarlet fever

Question 6

Which of the following would differentiate S. Aureus and S. Epidermidis

A. Mannitol fermentation
B. Catalase
C. Novobiocin
D. OF test

Answer 6

A. Mannitol fermentation

Question 7

Which of the following would differentiate N. Meningitidis and N. Gonorrhea

A. Glucose fermentation
B. Sucrose fermentation
C. Maltose fermentation
D. AOTA

Answer 7

D. AOTA

Question 8

Which of the following is destroyed by oxygen

A. Botulism
B. Streptolysin O
C. Catalase
D. Coagulase

Answer 8

B. Streptolysin O

Question 9

Neisseria meningitidis degrades which of the following sugars?

A. Glucose
B. Maltose
C. Lactose
D. A & b

Answer 9

D. A & b

Question 10

What is the indicator in Simmons citrate agar?

A. Phenol red
B. Bromthymol blue
C. Bromcresol purple
D. Neutral red

Answer 10

B. Bromthymol blue

Question 11

Green metallic sheen on EMB

Answer 11

Yersinia eE. coli

Question 12

Mucoidal colonies on EMB

Answer 12

Klebsiella

Question 13

Fish eye colonies on EMB

Answer 13

Enterobacter

Question 14

Bull’s eye colonies on CIN

Answer 14

Enterolitica

Question 15

Creamy whiten opaque on BAP

Answer 15

Staphylococcus

Question 16

Pinpoint on BAP

Answer 16

Streptococcus

Question 17

Safety pin appearance

Answer 17

Y. Pestis

Question 18

School fish appearance

Answer 18

H. druceyi

Question 19

Seagull wings

Answer 19

Campylobacter

Question 20

Mercury droplets

Answer 20

Bordatella

Question 21

Pitting/corroding

Answer 21

Eikenella corrodens

Question 22

Medusa head

Answer 22

b. anthracis

Question 23

Boxcar

Answer 23

Clostridium porfringens

Question 24

Gilding motility

Answer 24

Capnycytophaga

Question 25

Heat loving bacteria

Answer 25

Thermophile

Question 26

Ziehl-Neelseen AFB stain whole procedure with interpretation

Answer 26

1. Carbol fuchsin - primary
2. Heat - allow penetration
3. Acid alcohol - decolorizer
4. Methylene Blue - counterstain

Interpretation
Positive - red
Negative - blue