PCC BY 206 Lab Final EXAM QUESTIONS AND ANSWERS 100% SOLVED (Newest 2025) What is added to the Bile Esculin Agar to separate the Streptococcus bovis group and enterococci from other streptococci? - Correct Answers ✅Bile (oxgall) What shows a positive test for the Bile Esculin test? - Correct Answers ✅Medium is darkened within 48 hours What test do we use to determine Group D Streptococcus or Enterococcus? - Correct Answers ✅Bile Esculin Test What test do we use to isolate Salmonella and Shigella - Correct Answers ✅Hektoen Enteric Agar/Test Hektoen Enteric Agar is based on the ability to ferment what
- sugars? - Correct Answers ✅lactose, sucrose, salicin
What does a pink to orange growth result determine on the Hektoen Enteric Agar? - Correct Answers ✅Organism produces acid from lactose fermentation What converts hydrogen peroxide into water and gaseous oxygen? - Correct Answers ✅Catalase What test uses hydrogen peroxide? - Correct Answers ✅Catalase Test 1 / 2
PCC BY 206 Lab Final EXAM QUESTIONS AND ANSWERS 100% SOLVED (Newest 2025) What indicates a positive test for the catalase test? - Correct Answers ✅Visible bubble production What test is used to identify organisms that produce the enzyme catalase? - Correct Answers ✅Catalase Test What type of bacteria contain the enzyme nitrate reductase, performing a single-step reduction of nitrate to nitrite? - Correct Answers ✅Gram-negative bacteria What is the multi-step process which allows bacteria to enxymatically convert nitrate to molecular nitrogen (N2)? - Correct Answers ✅Denitrification In what test do we use the Durham test tube? - Correct Answers ✅Nitrate Reduction Test How do we examine for evidence of denitrification? - Correct Answers ✅By a visual inspection for the presence of gas in the Durham tube In the Nitrate Reduction Test, if no visible evidence of denitrification takes place, what are added to the medium to test for nitrate reduction to nitrite? - Correct Answers
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