Though plants, fungi, and prokaryotes all have cell walls, we place them in different taxa. Which of these observations comes closest to explaining the basis for placing these organisms in different taxa, well before relevant data from molecular systematics became available?
A) Some closely resemble animals, which lack cell walls.
B) Their cell walls are composed of very different biochemicals.
C) Some have cell walls only for support.
D) Some have cell walls only for protection from herbivores.
E) Some have cell walls only to control osmotic balance.
Sexual and asexual reproductive cells of fungi.
Pollen from a variety of common plants
Overview of the cell’s principal chemical building blocks
Human Cell Anatomy
Control of the cell cycle by cyclin-dependent kinases, and the checkpoints at which they operate
Photomicrographs comparing cheek epithelial cell nuclei