Final answer:
The volume of a cell affects its rate of nutrient intake and waste elimination. As a cell increases in size, its surface area-to-volume ratio decreases. Each filled volume cell does not necessarily add up to the total intake volume.
Step-by-step explanation:
The question is about how the filled volume of a cell adds up to the total intake volume. In biology, the volume of a cell affects its rate of nutrient intake and waste elimination. As a cell increases in size, its surface area-to-volume ratio decreases. If the surface area is insufficient to support the cell's increasing volume, the cell will either divide or die.
For example, in Figure 4.7, the cell on the left has a volume of 1 mm³ and a surface area of 6 mm², with a surface area-to-volume ratio of 6 to 1. On the other hand, the cell on the right has a volume of 8 mm³ and a surface area of 24 mm², with a surface area-to-volume ratio of 3 to 1.
Therefore, the answer to the question is that each filled volume cell does not necessarily add up to the total intake volume because the volume of a cell changes as it grows or divides, affecting the rate of nutrient intake and waste elimination.