Which statement best summarizes cell theory?

Which statement best summarizes cell theory?

• A. All things are made up of 1 or more cells.
• B. All cells are identical in size.
• C. Cells have structure and function.
• D. Cells are formed from pre-existing cells by cell division.

Answer: (A)

The main idea being tested is that life is built from cells—the essential building blocks of all organisms. The best summary is that all things are made up of one or more cells. This captures the universal claim of cell theory: every organism, from the simplest single cell to the most complex multicellular creature, is composed of cells. Other statements touch on true aspects—cells come in different sizes and shapes and do have structure and function, and cells arise from existing cells—but they don’t express the overarching idea as clearly.

The main idea being tested is that life is built from cells—the essential building blocks of all organisms. The best summary is that all things are made up of one or more cells. This captures the universal claim of cell theory: every organism, from the simplest single cell to the most complex multicellular creature, is composed of cells. Other statements touch on true aspects—cells come in different sizes and shapes and do have structure and function, and cells arise from existing cells—but they don’t express the overarching idea as clearly.