a. List two common electron carriers used in biological cells and summarize the role they play in the production of ATP.
b. Based upon the information in table, explain which type or types of enzyme supply electrons to thesecarriers.

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A Sampling of Enzymes, Their Substrates, and Their Reactions Action Breaks lactose down into glucose and galactose Hydrolyzes beta-lactam ring strand as a model Catalyzes the conversion of pyruvic acid to lactic acid Common Name Systematic Name Enzyme Class Substrates β-D-galactosidase Hydrolase Hydrolase Lactase Lactose PenicillinaseBeta-lactamase Penicillin DNA polymerase DNA nucleotidy Tnsferase DNA nucleosides Synthesizes a strand of DNA using the complementary transferase Lactate dehydrogenase name Oxidase Same as common Oxidoreductase Pyruvic acid Oxidoreductase Molecular oxygen Catalyzes the reduction of O2 (addition of electrons and hydroger) Cytochrome oxidase