Unicellular — Science definition
Made of a single cell that carries out every life process itself, as a Paramecium or a bacterium does.
Where it is taught
- Cell Theory & Discovering Cells — Cells, Transport & Cellular Energy, Life Science & Scientific Inquiry, Grade 7
In use
An organism made of a single cell is unicellular, and one built from many is multicellular.
Cell Theory & Discovering Cells
Questions using unicellular
Problem 1
A newly observed unicellular organism has no tissue. Does that contradict cell theory?
Answer and explanation
No. Unicellular organisms consist of one cell that carries out life processes. Tissues are not required in every organism.
Response criteria
- Explain the relevant biological process accurately.
- Use the supplied evidence and show calculation steps with units where needed.
- Connect a labeled model or mechanism with the claim.
- State an assumption, evidence limitation, or useful next observation.