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Question Video: Stating the Location of the Electron Transport Chain in Mitochondria Biology

Where in a cell, specifically, is the electron transport chain associated with oxidative phosphorylation located?

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Video Transcript

Where in a cell, specifically, is the electron transport chain associated with oxidative phosphorylation located? (A) The outer membrane of the mitochondria. (B) The inner membrane of the mitochondria. (C) The ribosomes of the mitochondria. (D) The mitochondrial matrix. Or (E) the nuclear envelope.

Oxidative phosphorylation is the term given to the final stage of aerobic respiration. Aerobic respiration breaks down glucose and other carbon-containing compounds to release energy, producing carbon dioxide and water in the process. Oxidative phosphorylation takes place in the mitochondria of most living eukaryotic cells. So we can already eliminate option (E), as this answer choice mentions the nucleus and not the mitochondria.

The inner space of the mitochondria is called the matrix. And this is where the mitochondrial DNA, along with ribosomes, enzymes, and other organic molecules, are contained. Mitochondria are surrounded by a double membrane, which consists of an inner and outer membrane. Within the inner mitochondrial membrane, there are collections of protein complexes that are specialized to transport electrons. We call this collection of proteins the electron transport chain. Oxidative phosphorylation relies on the electron transport chain to produce ATP by phosphorylating ADP.

So, using this information, we can determine our correct answer is option (B). The electron transport chain associated with oxidative phosphorylation is located in the inner membrane of the mitochondria.

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