BI110 Chapter Notes - Chapter 17: Enzyme, Cellular Respiration, Envoi
Document Summary
Surrounds cell, protects, & helps cell to respond to external environment. Selectively permeable; barrier that separates inside from outside. Essential b/c organisms need to retain materials they need to function. + maintain homeostasis & to protect those materials from external environment. Function of each type of membrane depends on composition of specific lipids and proteins in the membrane & carbohydrates on the surface. Flow of materials from cytoplasm into nucleus. Flow of material from external environment into cell. Selectively permeable membrane: can cross w/o assistance, & others cannot. Maintaining cell structure as it binds to cytoskeleton & ecm [tarp shaped by poles] Sensing molecules + other cells in external environment. Protein (respond to chemical signals) & carbohydrates able to detect key molecules + cells in external environment. E(cid:454)a(cid:373)ple: (cid:373)arker (cid:373)ole(cid:272)ules o(cid:374) (cid:272)ell"s (cid:373)e(cid:373)(cid:271)ra(cid:374)e identify it to nearby cells; Whole greater than sum of its parts. Co(cid:374)siste(cid:374)(cid:272)(cid:455) is like a sheet of oil (cid:449)here (cid:862)thi(cid:374)gs(cid:863) float i(cid:374)
