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___________is life's primary source of energy. a. Food b. Water c. Sunlight d. ATP

Energy ____________. a. cannot be created or destroy b. can change from one form to another c. tends to disperse spontaneously d. all of the above

Entropy _________ .(Choose all that are correct.) a. disperses b. is a measure of disorder c. always increases, overall d. is energy

If we liken a chemical reaction to an energy hill, then an ____________ reaction is an uphill run. a. endergonic b. exergonic c. ATP-assisted d. both a and c

__________are always changed by participating in a reaction. (Choose all that are correct.) a. Enzymes b. Cofactors c. Reactants d. Intermediates

Enzymes ________. a. are proteins, except for a few RNAs b. lower the activation energy of a reaction c. are changed by the reactions they catalyze d. a and b

Which of the following statements is not correct? A metabolic pathway ____________. a. is a sequence of enzyme-mediated reactions b. may be biosynthetic or degradative c. generates heat d. can include an electron transfer chain e. none of the above

A molecule that donates electrons becomes _____________ and the one that accepts electrons becomes ________________. a. reduced; oxidized b. reduced; reduced c. oxidized; reduced d. oxidized; oxidized

A free radical is an atom or molecule that _________ a. carries no charge b. has too many electrons c. has an unpaired electron d. has too few electrons

An antioxidant is a molecule that ___________. a. detoxifies free radicals b. degrades toxins c. balances charge d. oxidizes free radicals