Which of the following examples do not support the unified cell theory? The union of sperm and egg produces a zygote that is the beginning of a new organism Fungi are multicellular organisms Viruses are acellular infectious agents that cannot divide outside of a host cell Petri plates are inoculated with bacterial cells and after forty-eight hours several bacterial colonies ca
The Correct Answer and Explanation is:
The example that does not support the unified cell theory is:
Viruses are acellular infectious agents that cannot divide outside of a host cell.
The unified cell theory, which forms a foundational concept in biology, consists of the following key points:
- All living organisms are composed of cells.
- The cell is the basic unit of structure and organization in organisms.
- All cells come from pre-existing cells.
Let’s break down why the other examples support the unified cell theory:
- The union of sperm and egg produces a zygote that is the beginning of a new organism: This supports the cell theory because it demonstrates that life begins at the cellular level. The zygote is a single cell formed from the fusion of sperm and egg, and it divides and develops into a multicellular organism.
- Fungi are multicellular organisms: Fungi, like all multicellular organisms, are composed of cells, which supports the idea that all living organisms are made of cells. The theory also extends to multicellular life forms, showing that the basic unit of life is still the cell.
- Petri plates are inoculated with bacterial cells and after forty-eight hours several bacterial colonies grow: This example also adheres to the cell theory, demonstrating that cells can grow and multiply to form new life. Bacteria divide and form colonies, supporting the idea that new cells come from existing cells.
However, viruses are acellular infectious agents:
- Viruses are not made of cells and do not follow the basic principles of the unified cell theory. They lack the structure to carry out basic life functions on their own. Instead, they require a host cell to replicate, meaning they cannot divide or reproduce independently. This fundamentally challenges the idea that all living organisms or entities must consist of cells.
