Which option correctly lists the three classic tenets of cell theory in the history of cell biology?

• A. All living organisms are composed of cells; genes are located on chromosomes; evolution occurs by natural selection.
• B. All living organisms are composed of one or more cells; the cell is the basic unit of structure and function in living things; all cells arise from pre-existing cells.
• C. Cells are bounded by a plasma membrane; cells contain mitochondria; cells divide only by mitosis.
• D. All cells contain a nucleus; all organisms are multicellular; all cells arise spontaneously from nonliving matter.

Answer: (B)

Verified step by step guidance

1. Step 1: Understand that the question asks for the three classic tenets of cell theory, which are fundamental principles established in cell biology.
2. Step 2: Recall the historical development of cell theory, which includes: (1) all living organisms are composed of one or more cells, (2) the cell is the basic unit of structure and function in living things, and (3) all cells arise from pre-existing cells.
3. Step 3: Evaluate each option by comparing it to these three principles. The correct option should include these three statements exactly or very closely.
4. Step 4: Identify that the correct option is the one stating: 'All living organisms are composed of one or more cells; the cell is the basic unit of structure and function in living things; all cells arise from pre-existing cells.'
5. Step 5: Recognize that other options include statements unrelated to the core cell theory tenets, such as genes on chromosomes, mitochondria presence, or spontaneous generation, which are not part of the classic cell theory.