Correct Response: B. Both plant and animal cells are eukaryotic in that they have nuclei as well as complex structures enclosed within membranes. Only plant cells, however, have cell walls, a rigid layer outside the cell membrane that provides structural support and protection to the cell. A is incorrect because both types of cells have cellular, or plasma, membranes that separate the interior of the cells from the outside environment. Both also contain cytoplasm (C) within the cell membranes as well as ribosomes (D) that make proteins from amino acids.
