Question
Some bacteria have parasitic or pathogenic relationships, meaning ____.
Answer
Some bacteria have parasitic or pathogenic relationships, meaning that they provide no advantage or benefit to the host, but rather cause disease.
Note: Pathogenic bacteria may live intracellularly or extracellularly. For example, Chlamydia trachomatis, a common sexually transmitted infection, lives inside cells of the reproductive tract; Clostridium tetani, the cause of tetanus, lives outside of cells and produces toxins that enter the bloodstream.
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