Timbre, tone color, and tone quality are synonyms for the character of a sound or voice. The timbre of an instrument is made up of its unique vibrations, or frequencies.
Plant Cell Wall. One of the most important distinguishing features of plant cells is the presence of a cell wall. The relative rigidity of the cell wall renders plants sedentary, unlike animals, whose lack of this type of structure allows their cells more flexibility, which is necessary for locomotion. The plant cell wall serves a variety of functions.
But not all cells contain cell wall, this is why such cells contain cell membrane. Cell membrane, and wâ¦ithout the cell wall, protect the things going in and out of a cell, like nutrients and oxygen in, and waste and carbon dioxide out. Cell membrane could also be described as a wall for the house which is the cell.