In microbiology, a single-celled organism is called?

• A. Cardiac
• B. Bilateral
• C. Bacteria
• D. Chronology

Answer: (C)

Single-celled organisms studied in microbiology are typically bacteria. Bacteria are microscopic, unicellular organisms that do not have a nucleus, classifying them as prokaryotes, and they carry out all life processes within one cell. The other terms describe unrelated concepts: cardiac relates to the heart, bilateral means having two sides, and chronology concerns the order of events in time. So bacteria is the established term for this type of single-celled microorganism.