The study of which structure was instrumental in the formulation of the modern cell theory?

• A. Cells
• B. Mitochondria
• C. Chloroplasts
• D. Nuclei

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by understanding the modern cell theory, which states that all living organisms are composed of cells, cells are the basic unit of structure and function in organisms, and all cells arise from pre-existing cells.
2. Step 2: Recognize that the formulation of the modern cell theory required the study of structures that are fundamental to all living organisms. This means focusing on the most basic and universal unit of life.
3. Step 3: Evaluate the options provided: Cells, Mitochondria, Chloroplasts, and Nuclei. Consider which of these structures is the most foundational and universally present in all living organisms.
4. Step 4: Note that mitochondria and chloroplasts are organelles found only in specific types of cells (e.g., eukaryotic cells, plant cells), and nuclei are present only in eukaryotic cells. These structures are not universal to all life forms.
5. Step 5: Conclude that the study of cells, as the basic unit of life, was instrumental in the formulation of the modern cell theory, as cells are present in all living organisms and are the foundation of biological structure and function.