Figure 1-30 molecular biology of the cell, fifth edition ( garland science 2008) By the end of bio 130 you should be able to: Asking questions about lecture material: tutorial sessions after thursday"s lecture. Open q & a: blackboard discussion board: On friday afternoon prof mitchell will respond to questions. Figure 1-42 molecular biology of the cell, fifth edition ( garland science 2008) Multicellular organisms are composed of many different cell types. Typical plant cell: nucleus, endoplasmic reticulum, golgi apparatus, peroxisome, mitochondria, plasma membrane. Cell picture show, image by anne weston, cancer research uk. Many cellular functions occur at membranes: compartmentalization, scaffold for biochemical activities, selectively. H20 permeable barrier: transporting solutes, interactions between cells, responding to external signals. Control movement of molecules: lipid bilayer, membrane proteins. Lipid bilayer continued: phospholipids polar head group two hydrophobic tails, in an aqueous environment. Figure 10-8 molecular biology of the cell ( garland science 2008)