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Week 2 class notes Importance of Water: example of floating ice Cells:2 types, prokaryotic and eukaryotic- what are the differences What structures would you find in each type of cell? What is a “membrane bound organelle”? name them What types of organisms have cell walls, and which don’t? Cell membrane: structure (phospholipid bilayer – transmembrane proteins); -cellular transport: how things move in and out of cells: passive diffusion, facilitated diffusion, active transport, and endocytosis. -cellular communication and signaling (receptor or signal proteins imbedded in the membrane). Cell to cell recognition, signal translation. Energy: Chemical energy and the sun as source of all earth energy (except atomic). ATP as the rechargeable batteries of a cell, used for all functions Cellular respiration: converting chemical energy of sugars into ATP Photosynthesis: converting CO2 and H2O into sugars using the energy of sunlight Chemistry catch-up (lecture after the quiz) Anatomy of an atom, why atoms form bonds with other atoms to make molecules. Why carbon is so good at making the kinds of macromolecules that life is based on. Types of bonds: Covalent (electron sharing), ionic (electron taking), hydrogen bonding (polarity-based, electrons not shared).