Discussion
Consider the following statements about cell size.
1. A typical bacterium is smaller than a typical animal cell.
2. The surface area to volume ratio falls as a cell grows.
3. Cell size is limited chiefly by the strength of the plasma membrane.
Answer: B
The first two are correct. The third names the wrong constraint: the limit is set by the need to exchange materials fast enough across a surface that grows more slowly than the volume it must serve, so a cell reaches a ceiling long before its membrane fails mechanically.
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