Which is better 1 big cell or 4 small cells

4 samll cells.

the surface area to volume ratio is very important to a cell. surface area refers to the material exchange while volume refers to the rate of consumption. 4 small cell actyually may have larger surface area than a big cell, which means the faster rate of material echange. so it's better to have 4 small cells.

i believe the answer is a or 1

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.