IMED1002 Lecture Notes - Lecture 1: Cellular Respiration, Electron Shell, Protein Folding

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Cells can: divide, grow, convert energy, respond to stimuli, evolve. All living things- composed of cells- and hence are the fundamental unit of life. Cells=small, membrane-bound units filled with aqueous solution of chemicals (structural detail) Huge diversity in cell types: single cell bacteria, plants, animals. All cells: composed of the same sort of molecules, same basic metabolic processes, dna-similar, protein components-similar, fats-membranes. All living things- have evolutionary history so all cells are descended from an earlier living cell. Ancestral cell existed 3. 5 billion years ago hence formed cells today. Elements- cannot be chemically converted into other substances. Each element is composed of one type of atom. Elements of major importance to man 99% of elements in living organisms. Understand that electrons have different energy levels, and occupy orbitals around an atom"s nucleus. Know how many electrons are in the first 3 shells. Have general understanding of differences in bond energies between the various bond types:

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