Which statement best describes the second principle of the classical cell theory?

• A. All cells arise from pre-existing cells.
• B. The cell is the basic unit of structure and function in living organisms.
• C. All living organisms are composed of one or more cells.
• D. Cells contain hereditary information that is passed from cell to cell during division.

Answer: (B)

Verified step by step guidance

1. Identify the classical cell theory principles, which are foundational concepts in cell biology describing the nature and function of cells.
2. Recall that the first principle states: 'All living organisms are composed of one or more cells.'
3. Understand that the second principle focuses on the role of the cell itself within organisms, emphasizing its fundamental importance.
4. Recognize that the second principle is: 'The cell is the basic unit of structure and function in living organisms,' meaning cells are the smallest units that carry out life processes.
5. Note that the other options correspond to different principles or modern extensions of cell theory, such as hereditary information and cell division.