October 12, 2011 Biology 311C Lecture 20 • Homework due Monday on cellular respiration at 9 a.m. • Test tips: Read, stop to think, and re-read. Do the questions at the end of the each section/chapter. Use YouTube to look up videos on subject. Refer to learning outcomes. • Go to library to use introductory biology textbooks. Look at processes and see how they can go wrong. • Spontaneous reactions are exergonic and do not require the input of energy. There are enzymes that slowly strip the energy from glucose which is why glucose does not spontaneously combust. • Hydrogen peroxide spontaneously combusts into water and hydrogen. The right enzyme (catalase) is needed to push the reaction. • There is an activation barrier because the bonds between the reactants need to be broken first before creating products. • Enzymes facilitate a chemical reaction. • Electrons are zipped away from glucose and then they fall down hill and create a gradient.
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