Each of these reactions is involved in one of the four...

Each of these reactions is involved in one of the four stages of metabolism shown in Figure 21.4 . Identify the stage in which each reaction occurs. (a) Hydrolysis of starch to produce glucose (b) Oxidation of NADH coupled with synthesis of ATP (c) Conversion of glucose to acetyl-CoA (d) Oxidation of acetyl-CoA in a series of reactions where $\mathrm{NAD}^{+}$ is reduced and $\mathrm{CO}_{2}$ is produced

Each of these reactions is involved in one of the four stages of metabolism shown in Figure 21.4 . Identify the stage in which each reaction occurs.
(a) Hydrolysis of starch to produce glucose
(b) Oxidation of NADH coupled with synthesis of ATP
(c) Conversion of glucose to acetyl-CoA
(d) Oxidation of acetyl-CoA in a series of reactions where $\mathrm{NAD}^{+}$ is reduced and $\mathrm{CO}_{2}$ is produced

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Key Concepts

Digestion and Breakdown of Polysaccharides

This concept involves the hydrolysis of large, complex carbohydrates into simple sugars. In metabolism, enzymes break down macromolecules, such as starch, into glucose that can be used as a fuel in subsequent metabolic processes.

Glycolysis and Transition Reactions

Glycolysis is the pathway in which glucose is converted into pyruvate, with the concurrent production of ATP and NADH. The transition reaction further converts pyruvate into acetyl-CoA, bridging the gap between glycolysis and the citric acid cycle.

Citric Acid Cycle (Krebs Cycle)

The citric acid cycle is a key metabolic pathway where acetyl-CoA is oxidized, resulting in the production of NADH, FADH2, and the release of CO2. This cycle not only generates high-energy electron carriers but also plays a central role in energy production during cellular respiration.

Electron Transport Chain (Oxidative Phosphorylation)

This concept refers to the stage of metabolism where high-energy electrons from NADH and FADH2 are transferred through a series of membrane protein complexes. The energy released during these transfers is used to synthesize ATP, coupling the oxidation of NADH with the phosphorylation of ADP.

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