Homework Answers
A. Electron transport chain.
Explanation: cytochrome c is an enzyme found in bacteria, archaea in the respiratory electron transport chain of cells that is located in the inner cell membrane.
B. Organisms that contain cytochrome c as part of their respiratory electron transport chain are oxidase-positive and which turns reagent into blue or purple.
Organisms that lack cytochrome c as part of their respiratory chain do not oxidize the reagent. It leaves it colorless within the limits of the test, and are oxidase-negative.
So, organism A is positive.
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