Lab Exam 2

Question 1

Tube with phenol red turned yellow when bacteria were incubated for 24 hours. What is present in this tube that turned the broth yellow?

Answer 1

Acid

Question 2

Phenol Red tubes are used to test ____

Answer 2

Gram negative bacteria

Question 3

If your bacterial culture grows on MacConkey Agar and forms pink colored colonies, what will you know about the nutritional abilities of the bacteria?

Answer 3

Does not ferment lactose

Question 4

Describe EMB agar plate

Answer 4

Selective for Gram Negative , Differential for lactose and sucrose fermentation

Question 5

Why Coliscan easygel plates were used

Answer 5

To detect fecal and nonFecal coliforms

Question 6

Enterotube is used ______

Answer 6

Used to identify Entrobacteriaceae

Question 7

Why Durham tube is phenol red tube?

Answer 7

To detect gas

Question 8

Why do you use blood agar plate?

Answer 8

To differentiate bacteria

Question 9

What methods can you use for direct count for yeast or bacterial cells?

Answer 9

Hemocytometor

Question 10

What method can you use for indirect count for yeast or bacterial cells?

Answer 10

Spectrophotometer

Question 11

What are enterobacteriaceae? What is the cell morphology? What patient sample will contain these bacteria?

Answer 11

Fecal patient sample

Question 12

Define 
Endoparasite
Ectoparasite
Accidental parasite
Temporary parasite
Hyperparasitism

Answer 12

Endoparasite- live within the body of an organism.
Ectoparasite- live on the surface of the organism.
Accidental parasite- invade an organism
Temporary parasite- a mosquito that bites and leaves
Hyperparasitism- parasites having parasites like malaria

Question 13

Mosquito infected with plasmodium leaves _____, which is mixed in it’s _____, inside human when it bites, and ingest ____ from human’s ____.

Answer 13

Sporozites
Saliva
Merazoites
RBC