Which statements describe electron transport chain events? two electrons pass between cytochromes through a series of redox reactions. citrate metabolism results in the formation of one fadh2 and three nadh. nadh releases two hydrogen ions and donates two electrons to coenzyme q. atp synthase uses the energy from the redox reactions to generate atp.

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answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.