2007-07-19 14:15:28 · 3 answers · asked by Angel V 2 in Science & Mathematics ➔ Biology
Because cell walls make the cell very rigid. Animal cells are very fluid in both movement and composition. It also limits the access of external influences on the cell. A lot of the communication that goes in an animal cell deals with hormones and other stimulation binding to receptors on the cell surface. By having a cell wall you make it more difficult to access those stimulants. Another reason would be the addition and removal of nutrients, again having a rigid cell wall limits this.
2007-07-19 14:24:31 · answer #1 · answered by Greg 3 · 1⤊ 0⤋
Also plant cells do not move, or do not move much. Animals (almost all) animals are based upon movement. A cell wall is a complex starch which would inhibit movement, can you imagine if you leg was as stiff as a tree trunk or brittle as a stalk of hay.
2007-07-19 14:27:44 · answer #2 · answered by m b 2 · 0⤊ 0⤋
Plant's cell walls exist to give them structural stability. Animals usually have other means of that (like skeletons). Animal cells need to be permeable in some cases and a cell wall would prohibit that.
2007-07-19 14:20:33 · answer #3 · answered by Lady Geologist 7 · 0⤊ 1⤋