Pathogenic bacteria Pathogenic bacteria are unique because they have a membrane covering the filament. do not have flagella. have a unique basal body structure. can be identified and classified by differences in their flagellar proteins.

D. can be identified and classified by differences in their flagellar proteins.

Explanation:

Pathogenic bacteria are unique because they can be identified and classified by differences in their flagellar proteins. Flagellin protein is a distinct component of the flagellum, which is a whip-like structure attached to the back side of the pathogenic bacteria that helps the bacteria to move in forward direction. Some bacteria are Monotrichous bacteria means have a single flagellum while some bacteria are Lophotrichous bacteria means have multiple flagella at the back side of its body.

can be identified and classified by differences in their flagellar proteins.

Explanation:

Pathogenic bacterias are forms of bacteria that can be identified in various ways.

One of the ways to identify them is through examining of their features which can be classified by differences in their flagellar proteins.

Another way to identify them is knowing that they are the type of bacteria that causes infections in the host.

For example, Salmonella and E. coli

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substitution is the answer in this case