Question

Cellular respiration included the metabolic pathways of glycolysis, the Krebs cycle, and the electron transport chain, as represented in the figures. In cellular respiration, carbohydrates and other metabolites are oxidized, and the resulting energy-transfer reactions support the synthesis of ATP.
Using the information above, describe ONE contribution of each of the following in ATP synthesis.
1. Catabolism of glucose in glycolysis and pyruvate oxidation.
2. Oxidation of intermediates in the Krebs cycle.
3. Formation of a proton gradient by the electron transport chain.

Answer 1

Cellular respiration included the metabolic pathways of glycolysis, the Krebs cycle, and the electron transport chain is described below.

Explanation:

1. Catabolism of glucose in glycolysis and pyruvate oxidation-Produces NADH for use in ETC.Produces acetyl-CoA for entry into kerbs cycle.Provides energy for phosphorylation of ADP.

2. Oxidation of intermediates in the Krebs cycle-Produces NADH or FADH2 for use in ETC.Releases high energy electrons for use in ETC.Provides energy to pump protons against their concentration gradient.Produces GTP for phosphorylation of ADP.

3. Formation of a proton gradient by the electron transport chain-The flow of protons through membrane-bound ATP synthase generates ATP.Provides energy for phosphorylation of ADP.