Question

multiple choice question
which best describes the electron transport chain?

the hydrolysis of glycogen, releasing glucose

series of oxidation reduction reactions occurring across the inner membrane of the mitochondria leading to the production of atp

a series of reactions occurring in the mitochondria in which carbohydrates, fats and proteins are converted into co₂, nadh, fadh₂, and water

the synthesis of glucose from noncarbohydrates such as fats and amino acids

Explanation:

1. Analyze each option:

• Option 1: Glycogen hydrolysis releasing glucose is glycogenolysis, not electron transport chain (ETC). Eliminate.
• Option 2: ETC involves oxidation - reduction (redox) reactions across the inner mitochondrial membrane, using electrons from NADH/FADH₂ to generate ATP. This matches ETC.
• Option 3: The described process is the citric acid cycle (Krebs cycle) plus related oxidation, not ETC. Eliminate.
• Option 4: Glucose synthesis from non - carbohydrates is gluconeogenesis, not ETC. Eliminate.

Answer:

Series of oxidation reduction reactions occurring across the inner membrane of the mitochondria leading to the production of ATP (the second option)