A Researcher Is Trying to Define a Bacterial Species

Multiple Choice

A researcher is trying to define a bacterial species. How can she accomplish this task?

A) She can identify bacteria with similar rRNA sequences.
B) She can identify bacteria with similar sequences for nitrogen-fixation genes.
C) She can evaluate the "interbreeding capacity" between different bacteria.
D) She can isolate populations of bacteria that have undergone periodic selection.
E) She can identify bacteria with similar rRNA sequences, or isolate populations of bacteria that have undergone periodic selection.