Final answer:
The intersection of a row and column is termed a cell, which is also the smallest unit in biology. A 'vibrio' is the term for a comma-shaped prokaryotic cell. The cell membrane encloses and supports the cell but is selectively permeable to external substances.
Step-by-step explanation:
The intersection of a row and column is called a cell. In the context of biology, a cell is also recognized as the smallest independently functioning biological unit of an organism. Prokaryotic cells, which are simplified cells without a nucleus, can have various shapes. The term that refers to a prokaryotic cell that is comma-shaped is vibrio. Concerning cell membranes, an important feature is that it encloses the cytoplasm and supports the cell; however, it does not keep all external substances out of the cell as some molecules are allowed to pass through selectively