After 24 hours incubation at 35C in CO2, the cystine trypticase ...

[natalie2426]

After 24 hours incubation at 35C in CO2, the cystine trypticase agar tubes of an oxidase-positive, gram-negative diplococcus provides the following reactions:
 
  Control tubeyellow
   Glucoseyellow
   Maltoseyellow
   Lactoseyellow
   Maltoseyellow
  These results
  A) indicate a nonpathogen.
  B) indicate a potential pathogen.
  C) are invalid.
  D) should be read again after an additional 24 hours incubation.

Question 2

The nitrate reductase test for preculture screening of urines has low sensitivity if
 
  A) the organism does not reduce nitrate.
  B) the specimen is collected by suprapubic aspiration.
  C) there are fewer than 105 organisms/mL.
  D) all of the above.
  E) A and B

[Awesome]

Answer to Question 1

C

Answer to Question 2

D