What are mitochondrial respiratory chain complexes?

The mitochondrial respiratory chain (RC) consists, as detailed in Figure 1, of four membrane-bound, multimeric RC complexes (RCCs) and catalyzes the oxidation of reducing equivalents, mainly nicotinamide adenine dinucleotide (NADH), using the terminal electron acceptor oxygen (O2) in the inner mitochondrial membrane ( …

What is the significance of mitochondrial respiratory chain?

The mitochondrial respiratory chain catalyzes the oxidation of fuel molecules and transfers the electrons to molecular oxygen with concomitant energy transduction into adenosine triphosphate (oxidative phosphorylation) (seeChapter 106).

What is the role played by complex 1 in ETS?

Complex I is the first enzyme of the respiratory chain. It oxidizes NADH, which is generated through the Krebs cycle in the mitochondrial matrix, and uses the two electrons to reduce ubiquinone to ubiquinol.

What is the mitochondria structure?

The mitochondrion is a double-membraned, rod-shaped structure found in both plant and animal cell. Its size ranges from 0.5 to 1.0 micrometre in diameter. The structure comprises an outer membrane, an inner membrane, and a gel-like material called the matrix.

What are the complexes of mitochondrial?

These complexes are known as NADH: ubiquinone oxidoreductase (complex I), succinate dehydrogenase (complex II), ubiquinol–cytochrome c oxidoreductase (complex III, or cytochrome bc1 complex), cytochrome c oxidase (complex IV), and ATP synthase (complex V). Complex I is the first enzyme of the respiratory chain.

What is the main difference between complex 1 and complex 2 quizlet?

1. Transfer of electrons from NADH to O2 requires three large, membrane-bound complexes, typically called Complex I, III, and IV. Complex II contains the succinate dehydrogenase of the TCA cycle, but is only membrane-associated and does not pump protons.

Which is the first complex of ETS?

Complex I. To start, two electrons are carried to the first complex aboard NADH. Complex I is composed of flavin mononucleotide (FMN) and an enzyme containing iron-sulfur (Fe-S).

What is the main difference between complex 1 and complex 2?

Complex I accepts high energy electrons from NADH and pumps 4 protons from the matrix to the intermembrane space. Complex II is succinate dehydrogenase. Complex II converts succinate to fumarate and generates FADH2 in the Krebs cycle. Complex II directly gets FADH2 and delivers two electrons in ETS.

How does the structure of the mitochondria and its function?

A mitochondrion is a round to oval-shaped organelle found in the cells of almost all eukaryotic organisms. It produces energy, known as ATP, for the cell through a series of chemical reactions.

Why is the structure of mitochondria important?

The membranes create two compartments. The intermembrane space, as implied, is the region between the inner and outer membranes. It has an important role in the primary function of mitochondria, which is oxidative phosphorylation. The matrix contains the enzymes that are responsible for the citric acid cycle reactions.