GENERAL BOTANY Lecture 5

GENERAL BOTANY Lecture 5 - Electrons c) Neutrons B....

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GENERAL BOTANY Lecture 5 - I. Life and chemistry A. What elements are important in plants? 1. C 7. S 13. Cu 2. H 8. Ca 14. Zn 3. O 9. Fe 15. Cl 4. P 10. Mg 16. Mo 5. K 11. B 6. N 12. Mn C HOPKNS CaFe Mg B Mn CuZn Cl Mo C, H, O, N, P, S - 99% of (many) plant's weight Water (H 2 O) - 75 - 85% of cell weight B. What makes elements important? 1. Metabolism a) Anabolism (build) - photosynthesis b) Catabolism (break down) - respiration 2. Heredity and evolution 3. Growth and development 4. Growth regulation 5. Physiological ecology II. General chemistry A. Composition of elements 1. Atoms - smallest portion of an element a) Protons b)
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Unformatted text preview: Electrons c) Neutrons B. Function of atoms 1. Electron excitation (energy) 2. Chemical bonds a) Covalent - share electrons b) Ionic - charges attract c) Hydrogen - weak attraction of H & O C. Important chemical phenomena 1. Acid / base pH = -log[H + ] a) Equilibrium b) Availability & solubility of ions pH = pKa + log[products/reactants] c) Buffering capacity 2. Oxidation / reduction a) Donate / accept electrons III. Types of chemistry A. Inorganic - elements & ions B. Organic - alkanes, alkenes, alkynes, aromatics, alcohols, amines, etc. 1. Biochemistry...
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