| 单词 | cell wall |
| 释义 | cell wall (once / 39137 pages) n The cell wall is the protective, semi-permeable outer layer of a plant cell. A major function of the cell wall is to give the cell strength and structure, and to filter molecules that pass in and out of the cell. A cell is the smallest part of an organism that still contains that organism's elements. The word itself comes from the Latin cella, meaning "small room." Although the word is found prior to the 12th Century, its application to a cell didn't come about until 1845, and the idea of a plant’s cell wall came about in 1848. Animal cells do not have such a cell wall, but instead have a membrane that serves as a boundary for the cell. WORD FAMILYcell wall: cell walls USAGE EXAMPLESThe method uses enzymes to digest the cell wall, making it easier for researchers to introduce new genes. Nature(Nov 01, 2016) In wet, high-acidity vats, fresh bone turned to jelly and wood’s lignin—a molecular structure found in plants’ cell walls—deteriorated. Science Magazine(Oct 31, 2016) If you are a microbe that survived that trip, it means your cell walls were endowed with radiation resistance and can also be freeze-dried. National Geographic(Oct 02, 2016) n a rigid layer of polysaccharides enclosing the membrane of plant and prokaryotic cells; maintains the shape of the cell and serves as a protective barrier Hyper layer a relatively thin sheetlike expanse or region lying over or under another |
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