Microbiology Lab Practicum 3 Review

Which sugar can all bacteria use in phenol red sugar fermentation tubes?

• Lactose

• Maltose

• Glucose

• Sucrose

What enzyme is responsible for the degradation of gelatin in the gelatin hydrolysis test?

• Amylase

• Gelatinase

• Lipase

• Catalase

In the gelatin hydrolysis test, what does a positive result indicate?

• Gelatin remains solid

• Gelatin liquefies

• Gelatin turns blue

• Gelatin forms bubbles

What is the main component of gelatin that is degraded in the gelatin hydrolysis test?

• Starch

• Collagen

• Cellulose

• Hemoglobin

What does the Methyl Red test detect?

• Production of acetoin

• Production of acid by fermentation

• Presence of glucose

• Presence of oxygen

What is the significance of a yellowish color in the Voges-Proskauer test?

• Positive result

• Negative result

• Neutral result

• Inconclusive result

The Voges-Proskauer test is part of which set of tests?

• IMViC

• ABC

• XYZ

• DEF

What color does the Urea Broth turn when alkaline?

• Orange

• Yellow

• Pink

• Blue

What happens to casein if enough acid is produced during the Litmus Milk Test?

• It dissolves

• It forms a curd

• It evaporates

• It remains unchanged

What occurs during litmus reduction in the Litmus Milk Test?

• Litmus becomes red

• Litmus becomes colorless

• Litmus becomes green

• Litmus becomes yellow