Answer :

Final answer:

To identify Bacteroides using a dichotomous key, one would create a series of binary questions starting with broad characteristics and moving to more specific tests. The exact number of questions depends on the unique characteristics of Bacteroides compared to other bacteria in its group. Using a systematic approach found in manuals like Bergey's Manual of Determinative Bacteriology aids in this process.

Explanation:

To determine the number of questions needed in a dichotomous key to identify if an unknown is Bacteroides, one must create a series of binary questions that lead to the identification of all possible bacteria under consideration. This identification process involves using specific tests to differentiate among bacteria.

For example, one might start with questions about gram reaction, followed by cell shape, and then move on to more specialized tests such as oxygen requirements, biochemical tests (such as sugar fermentation panels), and physiological characteristics until Bacteroides can be uniquely identified. The number of questions will depend on the distinct characteristics of Bacteroides and how it differs from other genera in the group.


Creating a dichotomous key includes understanding basic principles of taxonomy and applying information from sources like Bergey's Manual of Determinative Bacteriology. Since Bacteroides comprise a significant part of the human gut microbiota and only a few species are pathogenic, the key would include questions that isolate traits unique to Bacteroides among the CFB group bacteria, which may have similar features. Completing a table with test outcomes assists in this process by structuring observations systematically.

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