What is the basic premise of cell theory?

The basic premise of cell theory encompasses the foundational concepts regarding the nature of cells and their role in living organisms. One of the key tenets is that all living organisms are composed of cells. This principle establishes that cells are not only the basic structural and functional units of life but also that they make up the entirety of biological entities, from the simplest bacteria to the most complex multicellular organisms, including plants and animals.

This concept emphasizes that regardless of the size or complexity of an organism, cells are the building blocks from which all life is constructed. Each cell performs various functions that contribute to the overall operation and survival of the organism, highlighting the importance of cellular organization in biological systems.

While the other options touch upon important aspects of cell theory, such as the idea that cells arise from pre-existing cells or that they contain genetic material, the assertion that all living organisms are composed of cells is the fundamental statement that underpins the entire theory and is crucial for understanding the biological sciences.