Question

1. If bacteria oxidize the the Oxidase test reagent the reagent will turn Bright Pink in color.

   a. Agree
   b. Disagree

1. Cytochrome oxidase is an enzyme found in some bacteria that transfers electrons to oxygen.

   a. Agree
   b. Disagree

1. Phenol Red pH indicator will turn what color under alkaline conditions?

   	a.	Yellow
   	b.	Blueish Green
   	c.	Cherry Red or Bright Pink
   	d.	Red

Glucose, Sucrose and Lactose are

a. substrates for amino acid fermentation

b. substrates for carbohydrate fermentation

c. substrates for Lipid fermentation

d. end products of carbohydrate fermentation

An enzyme is

a. a catalyst which promotes changes in specific substances or substrates

b. a five carbon carbohydrate

c. an amino acid containing a sulfur group

d. a nucleic acid required in fermentation reactions.

Answer 1

1. b. Disagree

Because of if the test organisms produce cytochrome oxidase , the oxidase reagent will turn blue or purple within 15 seconds.

2.a. Agree

Cytochrome oxidase is an enzyme found in some bacteria and mitochondria that transfers electrons to oxygen.

3.c. cherry red or bright pink

Above ph 8.2 phenol red turns a bright pink colour

4.b. substrates for carbohydrates fermentation

End products are ethanol, lactic acid , carbon dioxide and hydrogen gas.

5.a. enzyme is a catalyst which promotes changes in substances and substrates.

This lead to formation of new products.

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