_ [MCAT Question of the Day, Click Display Images To See] + Join us on Facebook<http://mcatquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=a9039258cc&e=61d7ba7392> + Connect on Twitter<http://mcatquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=17f64565ad&e=61d7ba7392> Catalyzing Chemical Reactions Enzymes are one of the key proteins in cells and facilitate chemical reactions. How does a typical enzyme catalyze a chemical reaction? A. It eliminates the activation energy of a chemical reaction. B. It reduces the activation energy of a chemical reaction. C. It provides additional energy to the chemical reaction. D. It contains a covalently bound substrate, which is needed for the chemical reaction. To see the solution, visit the following link: http://mcatquestionoftheday.com/biology/catalyzing-chemical-reactions/<http://mcatquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=118b5a3bc1&e=61d7ba7392>