Why does DNA limit cell size?
Living cells store information in DNA that is used to build molecules needed for cell growth. As cell size increases, demands on that information increase. If the cell gets too big, the DNA would not be able to serve the needs of the growing cell. Nutrients enter and waste leaves a cell through the cell membrane.
What limits the size of a cell?
Cell size is limited by the surface area to volume ratio of the cell. As the volume of a cell increases, it becomes harder to efficiently transport materials in and out of the cell.
What are the limitations of measuring cell size?
Answer: Most cells are too small to be seen with the naked eye (the few exceptions include some egg cells, some of which are up to 13 centimeters in diameter, like the ostrich egg). Cells are so small because of the constraints of surface-area-to-volume ratio.
How is cell size regulated?
Cells of a given type maintain a characteristic cell size to function efficiently in their ecological or organismal context. They achieve this through the regulation of growth rates or by actively sensing size and coupling this signal to cell division.