Which option correctly lists the three basic parts of the cell theory?

• A. All living things are made of cells; cells can form only by chemical synthesis in the cytoplasm; energy production occurs only in chloroplasts.
• B. All living organisms are composed of one or more cells; the cell is the basic unit of structure and function in organisms; all cells arise from pre-existing cells.
• C. All cells contain a nucleus; all organisms are multicellular; all cells arise spontaneously from nonliving matter.
• D. Cells are the basic unit of life; heredity is carried only by proteins; all cells are identical in structure and function.

Answer: (B)

Verified step by step guidance

1. Recall the three fundamental principles of the cell theory, which are widely accepted in cell biology.
2. First, understand that the cell theory states that all living organisms are composed of one or more cells, emphasizing that cells are the basic building blocks of life.
3. Second, recognize that the cell is the basic unit of structure and function in all living organisms, meaning that all physiological processes occur within cells.
4. Third, remember that all cells arise from pre-existing cells, which highlights the continuity of life through cell division.
5. Compare each option given in the problem to these three principles to identify the correct statement that matches the established cell theory.