Biochemical Tests for Unknowns 22-23

What does decarboxylase do in biochemical tests?

It catalyzes the removal of carbon dioxide from amino acids.

What is the purpose of Methyl Red in biochemical testing?

It indicates the presence of acid produced by fermentation.

What does a positive result in the Indole test indicate?

The presence of tryptophanase, which converts tryptophan to indole.

What is Triple Sugar Iron Agar (TSI) used for?

To differentiate members of Enterobacteriaceae based on their ability to ferment sugars.

What does a positive result in the Catalase Test indicate?

The presence of catalase enzyme that breaks down hydrogen peroxide.

What does Simmons Citrate test for?

The ability of an organism to utilize citrate as its sole carbon source.

What indicates a positive result in the Nitrate Broth test?

The reduction of nitrate to nitrite or further reduced products.

What is the significance of Urea Broth in biochemical tests?

To test for urease activity, which hydrolyzes urea to ammonia.

What do the abbreviations GLU, LAC, MAN, MAL, and SUC represent?

They represent different types of sugars used in fermentation tests.

What does the Fluid Thioglycollate Medium (FTM) test for?

It indicates the oxygen requirement of microorganisms.

What does the Lysine Decarboxylase test determine?

The ability of an organism to decarboxylate lysine, creating an alkaline environment.

What does a positive result in the Phenylalanine test indicate?

The presence of phenylalanine deaminase that converts phenylalanine to phenylpyruvic acid.

What is a common indicator used in Methyl Red-Vogues Proskauer Broth?

Methyl Red is used to detect acid production.

What is the purpose of Nutrient Gelatin in biochemical testing?

To determine the ability of an organism to liquefy gelatin.

What does a positive result in Motility Medium (MTM) show?

The organism's ability to move away from the stab line, indicating motility.

What is the purpose of Tryptone Broth in biochemical tests?

To assess the ability to produce indole from the amino acid tryptophan.