Cell wall Cell wall (A) Protoplasm (B) FIGURE 3-5 (A) Cells lcated at the growing tip of Pinus (pine) are specialized for cell growth and division. Their thin cell walls allow sugar, water, and other nutrients to enter the cells easily; however, these cells are too soft and weak to be useful as bark or the shell of a nut (x400). (B) These "stone cells" rovide strength in a coconut shell (Cocos nucifera) and therefore protect the seed. Almost the entire cell volume is wall. Protoplasm was present when the cells were young, growing, and synthesizing their walls; however, after the walls were completed, cell metabolism was not necessary, and the protoplasts died (remnants are present in the tiny black hole in the center of each cell). Such modifications make it impossible for a stone cell to be a dividing, growing cell as in (A) (x 200).

Cell wall Cell wall (A) Protoplasm (B) FIGURE 3-5 (A) Cells lcated at the growing tip of Pinus (pine) are specialized for cell growth and division. Their thin cell walls allow sugar, water, and other nutrients to enter the cells easily; however, these cells are too soft and weak to be useful as bark or the shell of a nut (x400). (B) These "stone cells" rovide strength in a coconut shell (Cocos nucifera) and therefore protect the seed. Almost the entire cell volume is wall. Protoplasm was present when the cells were young, growing, and synthesizing their walls; however, after the walls were completed, cell metabolism was not necessary, and the protoplasts died (remnants are present in the tiny black hole in the center of each cell). Such modifications make it impossible for a stone cell to be a dividing, growing cell as in (A) (x 200).

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter4: Cells

Section: Chapter Questions

Problem 13TYK

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