Chapter 4

The text notes that animals could not function as they do if their cells were encased in the thick cell walls that surround plant cells. What about the reverse case? Why would plants be unable to function if their cells lacked cell walls?

The earliest organisms we have evidence of were all single-celled. Why do you think life had to "start small" like this?

Why do membranes figure so prominently in eukaryotic cells? What essential function do they serve?