1) Which of the following is DIFFERENTIAL media?

Answer
A.	Blood agar

B.	Koser citrate medium

C.	Nutrient broth

D.	MacConkey agar

2)Organisms that demand nutrients supplied in organic media supplemented with vitamins, amino acids and tissue extracts of unknown composition are called what?

Answer
A.	aerobic 

B.	organoheterotrophs

C.	complex

D.	fastidious 

3)What is a microbial colony?

Answer
A.	a pure grouping of microbes on a plate originating from a single progenitor cell 

B.	a biofilm of fungi and bacteria growing on SAB agar 

C.	a mixed culture of microbes on a plate of at least two species 

D.	a culture of microbes growing in liquid broth 

4) Which of the following bacteria is the most common cause of dental caries (cavities)? 

Answer
A.	Streptococcus mutans 

B.	Porpyromonas gingivalis

C.	Treponema denticola

D.	Streptococcus pyogenes 

5) Dental plaque is a complex group of microorganism that adhere to one another and communicate with each other. What is this called?

Answer
A.	a biohazard

B.	a biofilm

C.	a cavity

D.	a bacterial party 

6) Ideally, where on the plate will you find isolated colonies when you have performed the streak plate properly?

Answer
A.	On the lid of the plate.

B.	In the center of the plate from streak number 4.

C.	On the side of the plate from streak number 2.

D.	On the side of the plate from streak number 1. 
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