enterobacteriaceae

Question 1

natural habitat of enterobacteriaceae

Answer 1

intestinal tract of humans and animals

Question 2

are enterobacteria motile or nonmotile?

Answer 2

both motile with peritrichous flagella or nonmotile

Question 3

selective media for enterobacteriaceae

Answer 3

MacConkey

Question 4

test result for catalase and oxidase

Answer 4

catalase: positive
oxidase: negative

Question 5

describe the colonies of E coli in culture

Answer 5

circular, convex smooth colonies with distinct edges; some produce hemolysis on blood agar

Question 6

difference of Enterobacter colonies from E. coli

Answer 6

more mucoid

Question 7

describe the colonies of Klebsiella in culture

Answer 7

large and very mucoid

Question 8

biochemical differentiation involves

Answer 8

1. Carbohydrate fermentation patterns
2. activity of aminoacid decarboxylases
3. other enzymes

Question 9

indole test is positive for

Answer 9

E. coli, Klebsiella oxytoca, Morganella

morganii

Question 10

TSI agar differentiates

Answer 10

salmonellae and shigellae from other

enteric gram-negative rods in stool cultures