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15 Mar 2019
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Hundreds of amino acids held together by peptide bonds. Amino acid polymers: all amino acids have carbon, hydrogen, amino group (nh2) and acid group (cooh, 3 bonds to carbon and 1 to 20 possible amino acids. Many roles in cell: enzymes catalyze a single chemical reaction, hormones, structure (hair, horns, silk) Small molecules-20 kinds: 1 amino group, 1 carboxyl group, 1 r group (20 different choices) Different sequence of amino acids makes different protein. Peptide bond formation: phenylalanine and leucine are combined. Energy-the capacity to do work: kinetic energy-energy of movement, light, heat, electricity, potential energy-stored energy, chemical energy, batteries, positional, energy is always conserved. Energy flow on earth: energy input from the sun (ultimate source, photoautotrophs (plants, other producers, heterotrophs (consumers, decomposers, energy output (mainly heat) How does energy flow in chemical reactions: chemical reaction-forming and breaking chemical bonds among atoms, ionic and covalent bonds, reactants (substrates): starting materials, products: result of the reaction.

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