BIOA01H3 Lecture : lecture8 for BGYA01

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Clare Hasenkampf

Document Summary

We have now looked at structures inside the cell now let"s look. Cells often secrete important materials outside the cell, these materials can be very important to the structure of the cell and to the health of the organism. [remember just because something is outside the cell, it does not mean it is outside the organism. ] One important structural feature outside of cells of many eukaryotes is the cell wall. Animals do not have cell walls but plants, fungi, and most groups of protists do. The cell wall is a semi-rigid structure outside of the plasma membrane. Cell walls are made of polysaccharides and proteins, but the different kingdoms use different polysaccharides. Plant cell walls have cellulose as the dominant polysaccharide, while fungal cell walls have the modified polysaccharide chitin as its major component. Let"s take a quick look at a plant cell wall. Figure 4. 24, page 91 and figure 4. 7, page 77.