Question

5. Bacterial species break down glucose to pyruvate using a variety of metabolic pathways. If acidic products are produced, pH indicators can show positive glucose fermentation by the presence of acid. However, some bacteria use metabolic pathways that produce acid products which then quickly change to neutral end-products such as the butylene glycol pathway, which produces neutral end products, including acetoin and 2,3-butanediol. Other organisms use the mixed acid pathway, which produces acidic end products such as lactic, acetic, and formic acid. These acidic end products are stable and will remain acidic. Indicate, by circling, which of the following pathways occurred in the wine and yogurt production? How could you test for the by-products? (1 pt) Glucose or other sugars C-C-C-C-C-C Pyruvic Acid Acids that break down to neutral acetylmethylcarbinol (VP positive) Enters a variety of metabolic pathways depending on the organism with the following fermentation by-products Lactic Acid Mixed acids (Methyl Red test) Propionic acid, Acetic acid & CO2 Acetic acid, Ethanol, & Succinic acid Ethanol & CO2

          5. Bacterial species break down glucose to pyruvate using a variety of metabolic pathways. If acidic products are produced, pH indicators can show positive glucose fermentation by the presence of acid. However, some bacteria use metabolic pathways that produce acid products which then quickly change to neutral end-products such as the butylene glycol pathway, which produces neutral end products, including acetoin and 2,3-butanediol. Other organisms use the mixed acid pathway, which produces acidic end products such as lactic, acetic, and formic acid. These acidic end products are stable and will remain acidic. Indicate, by circling, which of the following pathways occurred in the wine and yogurt production? How could you test for the by-products? (1 pt)

Glucose or other sugars
C-C-C-C-C-C
Pyruvic Acid

Acids that break down to neutral acetylmethylcarbinol (VP positive)

Enters a variety of metabolic pathways depending on the organism with the following fermentation by-products

Lactic Acid

Mixed acids (Methyl Red test)

Propionic acid, Acetic acid & CO2

Acetic acid, Ethanol, & Succinic acid

Ethanol & CO2

5. Bacterial species break down glucose to pyruvate using a variety of metabolic pathways. If acidic products are produced, pH indicators can show positive glucose fermentation by the presence of acid. However, some bacteria use metabolic pathways that produce acid products which then quickly change to neutral end-products such as the butylene glycol pathway, which produces neutral end products, including acetoin and 2,3-butanediol. Other organisms use the mixed acid pathway, which produces acidic end products such as lactic, acetic, and formic acid. These acidic end products are stable and will remain acidic. Indicate, by circling, which of the following pathways occurred in the wine and yogurt production? How could you test for the by-products? (1 pt)

Glucose or other sugars
C-C-C-C-C-C
Pyruvic Acid

Acids that break down to neutral acetylmethylcarbinol (VP positive)

Enters a variety of metabolic pathways depending on the organism with the following fermentation by-products

Lactic Acid

Mixed acids (Methyl Red test)

Propionic acid, Acetic acid CO2

Acetic acid, Ethanol, Succinic acid

Ethanol CO2

Added by Sonia D.

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