9 Multiple Choice Question FADH_(2) and NADH are both __ A. inputs of the Krebs cycle B.coenzymes C. kinds of mitochondria

The correct answer is **B. coenzymes**.<br /><br />Here's why:<br /><br />* **Coenzymes:** Both FADH₂ and NADH are coenzymes that act as electron carriers in cellular respiration. They pick up electrons during metabolic processes (like glycolysis and the Krebs cycle) and deliver them to the electron transport chain, where their energy is used to generate ATP.<br /><br />* **Inputs of the Krebs cycle:** NAD⁺ is an input of the Krebs cycle, and it is *reduced* to NADH during the cycle. FADH₂ is *produced* by the Krebs cycle, not an input.<br /><br />* **Kinds of mitochondria:** FADH₂ and NADH are molecules that *function within* the mitochondria, not types of mitochondria themselves.<br />