BIOLOGY

Question 6

 

You are working up a male genital culture.

You see no growth on the blood agar plate but small colonies growing on the chocolate agar plate. The gram stain shows gram negative cocci in pairs.

Which test will you do next?

 

a) oxidase

b) motility

c) catalase

d) indole

 

Question 7

 

You are working up a cerebrospinal fluid culture.

You find colonies growing on blood agar as well as chocolate agar.

The colonies are oxidase positive gram negative cocci.

The colonies ferment glucose and maltose but not sucrose or lactose.

You identify the pathogen as

 

a) Neisseria meningitidis

b) Haemophilus influenzae

c) Streptococcus pneumoniae

d) Neisseria gonorrhoeae

 

Question 8

 

You are working up a urine culture.

You see >100 colonies that are gray and flat on the blood agar plate and >100 colonies that are bright pink on the MacConkey agar.

The IMViC results are Indole positive, Methyl Red positive, Vogues-Proskauer negative, Citrate negative.

You have identified the pathogen as

 

a) Citrobacter freundii

b) Escherichia coli

c) Enterobacter aerogenes

d) Proteus vulgaris

 

Question 9

 

You are working up a stool culture.

On MacConkey agar you see many bright pink colonies and many clear colonies.

Which colonies are potential pathogens that require further testing?

 

a) Clear colonies, non lactose fermenters

b) Bright pink colonies, non lactose fermenters

c) Bright pink colonies, lactose fermenters

d) Clear colonies, lactose fermenters

 

Question 10

 

DNA technology is useful in the identification of :

 

a) pathogens that are unable to be grown readily on artificial lab media. 

b) pathogens that are no longer alive in the patient sample,

c) species that cannot be differentiated by conventional testing.

d) All of the above.

 

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