Question

The H2S gas combines with the iron in the media to form ferric sulfate Select one: True O False What is the key enzyme for this reaction? • NH HN NH L-Tryptophan HN Indole Pyruvate Ammonia Select one: O a thiosulfate reductase O b. cysteine desulfurase O c. tryptophanase O d. All of these are correct answers In a urea broth test, a bacterial species is tested positively. This bacterium must be able to Select one: O a. absorb urea as a main source of nitrogen and carbon Ob turn the urea broth from red to bright yellow (acidic) O ci release urease as an exoenzyme. O d. digest proteinsshd release urea as a waste product.

help please

Answer 1

1. The reaction between the H2S will react with iron to form ferrous sulphide and not ferric sulphate. Hence the correct answer is: false.

2. The reaction given is catalysed by the tryptophanase enzyme. Hence the correct answer is: tryptophanase.

3. In the urea broth test, the bacteria releases the exoenzyme which converts urea to nitrogen and carbon and then the bacteria absorbs these nitrogen and carbon. Hence the correct answer is: release urease as an exoenzyme.

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