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When the reactants are heated, the average kinetic energy of the molecules increases. This means that more molecules are moving faster and hitting each other with more energy. If more molecules hit each other with enough energy to react, then the rate of the reaction increases.
B. Protein molecules speed up chemical reactions in cells but do not help other molecules get in and out of cells. A. Protein molecules speed up chemical reactions in cells and help other molecules get in and out of cells.. Flow of electrons through the electron transport chains in the thylakoid membrane causes pumping of protons across the thylakoid membrane.