Question

Two enzymes in this organelle use lipoic (“lie-POH-ick”) acid as an anti·oxidant. A heme (“heem”), iron-sulfur, and flavoprotein (20[1])complex (20[1])in this organelle (20[1])de·hydrogenates a four-carbon di·carboxylic (20[1])acid, then uses the hydrogen to convert coenzyme Q to QH2. (20[7])To maintain this organelle’s redox (20[1])potential, cells shuttle electrons into it via (20[1])malate, (20[3])rather than pumping in (20[1])reduced (20[1])(*) nico·tin·amide. Complexes I (“one”) through IV (10[1])(“four”) dock in this (10[1])organelle. (10[1])This organelle oxidizes acetyl-CoA by (10[1])condensing it (10[1])with (10[1])oxalo·acetate, (10[3])then (10[1])uses energy stored (10[1])in NADH (10[1])to build up a chemiosmotic (“kem-ee-oz-MAH-tick”) proton gradient. The (10[1])cristae (“KRIS-tay”) folds of this organelle contain (10[1])ATP synthase. For 10 points, name this organelle that houses the Krebs cycle and electron transport chain. ■END■ (10[3])

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