rift valley. 1  A long, narrow valley lying between two normal geologic faults. Rift valleys usually form where the Earth's lithosphere has become thin through extension associated with plate-tectonic processes. 2  The deep undersea valley located along the center of the mid-ocean ridge.
Vacuoles and lysosomes have similar functions. Vacuoles in plant cells are in some respects the equivalent of lysosomes in animal cells. The environment inside a vacuole is slightly acid (pH about 5.0) whilst for the rest of the cytosol it is slightly alkaline (about pH 7.2).acuoles and lysosomes have similar functions. Vacuoles in plant cells are in some respects the equivalent of lysosomes in animal cells. The environment inside a vacuole is slightly acid (pH about 5.0) whilst for the rest of the cytosol it is slightly alkaline (about pH 7.2).
Vacuoles are large vesicles that are derived from the Endoplasmic reticulum and Golgi apparatus. They are membrane- bound sacs and serve many functions such as storage. Animal cell vacuoles are much smaller and more numerous than plant cell vacuoles, because in plant cells, they store a great deal of water. If an animal cell performs phagocytosis, a food vacuole forms and fuses with a lysosome(containing enzymes) for furthering processing.