ex 7: comparison of colony appearance of coliform

Question 1

Does only escherichia coli grow on emb or endo

Answer 1

NO

,it is differential in that e.coli grows distinctive colonies, however, other bacteria can grow on in with different appearances and inhibit others

Question 2

EMB

Answer 2

-grows gram negative bacteria, partically enteric
-differentiates lactose fermenters (purple/green colonies) from nonlactose (white, clear)

Question 3

ENdo

Answer 3

gram negative bacteria
-differentiates between lactose (red or pink) and non lactose

Question 4

Nutrient

Answer 4

growsa wide vaiety of bacteria

Question 5

what are the coliform bacterias that we discovered

Answer 5

e coli
green on endo, EMB

Question 6

C freundii looked like what on the Endo Agar

Answer 6

GREEN meaning it is a lactose fermenter

Question 7

Basically everything was cream/ white except for

Answer 7

ECOLI on emb and endo
C frueindi on Endo

NO GROWTH ON B SUBTILIS EMB (it grew on endo but shouldnt since it is gram pos but yea)
S aureus on nboth emb and Endo it did not GROW

Question 8

ENdo restricts gram pos growth using

Answer 8

SALTS emb does it using its methylene blue dye and the eosin