Compounds hazardous to the plant cell are sometimes stored in a vacuole within the cell. Newly synthesized proteins start to fold to their secondary and tertiary structures within the endoplasmic reticulum. The membranes of phagosomes come from the plasma membrane. Lysosomes have a pH higher than the cytosol. The rough endoplasmic reticulum has ribosomes attached.
Lipid biosynthesis occurs in the smooth endoplasmic reticulum.
The genetic material of prokaryotes is found in the nucleoid. Mitochondria are present in both animals and plants. Typically the largest organelle in an animal cell is the nucleus. A plant cell can have as its largest organelle a central vacuole. The plasma membrane of either a plant or animal cell regulates traffic of materials in and out of the cell.