The electron transport chain (ETC), or respiratory chain, is linked to proton movement and ATP synthesis. Select the STATEMENTS that ACCURATELY describe the electron transport chain. (True/False)

a)Electron transfer in the ETC is coupled to proton transfer form the matrix to the intermembrane space. b)Electrons generated by he citric acid cycle in the mitochondrial matrix enter the ETC. c)The outer membrane of mitochondria is readily permeable to small molecules and hydrogen ions. d)Electron carriers in the mitochondrial matrix include ubiquinone (coenzyme Q), FMN, and cytochrome c. e)Prosthetic groups, such as iron-sulfer centers, are directly involved with electron transfer. f)Electron carriers are organized into four complexes of proteins and prosthetic groups. g)The reactions of the ETC take place in the outer membrane of mitochondria.

The following options are true;

a) Electron transfer in the ETC is coupled to proton transfer form the matrix to the intermembrane space

c)The outer membrane of mitochondria is readily permeable to small molecules and hydrogen ions.

d) Electron carriers in the mitochondrial matrix include ubiquinone (coenzyme Q), FMN, and cytochrome c.

f)Electron carriers are organized into four complexes of proteins and prosthetic groups

Explanation:

ETC involves series of steps in which electrons are passed rapidly from one component to the next to the endpoint of the chain, where the electrons reduce molecular oxygen, producing water. This requirement for oxygen in the final stages of the chain can be seen in the overall equation for cellular respiration, which requires both glucose and oxygen.

A complex is a structure consisting of a central atom, molecule, or protein weakly connected to surrounding atoms, molecules, or proteins. The electron transport chain is an aggregation of four of these complexes (labeled I through IV), together with associated mobile electron carriers. The electron transport chain is present in multiple copies in the inner mitochondrial membrane of eukaryotes and the plasma membrane of prokaryotes.

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