Test on Microbiological Diagnostic Tests Summary
Microbiological Diagnostic Tests Summary for Students
Bacterial Biochemical Tests
20 questions
Question 1: Pink Milk is the positive appearance for Lactose Fermentation Litmus Milk.
A. Ano
B. Ne
Explanation: The study materials indicate that for Lactose Fermentation Litmus Milk, the positive appearance is Pink Milk.
Question 2: In the Utilization of Unusual Carbon test, a clear appearance in Sodium Citrate Broth signifies that the organism has utilized citrate as its sole carbon source.
A. Ano
B. Ne
Explanation: A clear appearance in Sodium Citrate Broth indicates a negative result for the Utilization of Unusual Carbon test, meaning there was no growth and therefore no utilization of citrate as the carbon source. A positive result, indicating utilization, would be observed as turbidity or a pellicle at the top.
Question 3: Acetyl Methyl Carbinol functions as the pH indicator in the Voges-Proskauer test.
A. Ano
B. Ne
Explanation: The study materials state that Alpha Napothol and H2O2 are the reagents for the Glucose Fermentation test (Voges-Proskauer), while Acetyl Methyl Carbinol is listed as an end product.
Question 4: Gelatinase activity is confirmed if the gelatin medium remains liquid after cooling.
A. Ano
B. Ne
Explanation: The study materials indicate that for the Hydrolysis of Gelatin test, a positive appearance (Pos. Appearance) for gelatinase activity is 'Liquid after cooling', while a negative appearance (Neg. Appearance) is 'Solid'.
Question 5: A black (golden) appearance indicates a positive result for starch hydrolysis.
A. Ano
B. Ne
Explanation: The study materials indicate that a black (golden) appearance is the negative appearance for the hydrolysis of starch, while a clear zone around growth is the positive appearance.