Articles > Quizzes & Surveys > Unicellular definition – quiz Unicellular definition – quiz Quiz Choose the best answer. 1. What is unicellular? An organism with multiple cells An organism consisting of a single cell An organism with cells acting as a single unit 2. Which of the following is correct? All unicellular organisms are prokaryotes. All unicellular organisms are single-celled. All unicellular organisms are bacteria. 3. Which of the following is an example of a unicellular organism? Red blood cell Muscles Pathogen 4. Unicellular organisms lacking nucleus Bacteria Amoeba Protists 5. Unicellular autotrophs Amoebae Oomycetes Algae Send Your Results (Optional) Your Name To Email Time is Up!