What are the 3 steps of aerobic cellular respiration?

Answer 1

Aerobic respiration is the discharge of energy from glucose or another organic substrate in the presence of Oxygen

The three stages of aerobic respiration are glycolysis, citric acid cycle, and oxidative phosphorylation.

Glycolysis takes place inside the cytoplasm; the citric acid cycle takes place inside the mitochondria, and the oxidative phosphorylation takes places in the mitochondria.

Cellular respiration is in three stages as follows:

GLYCOLYSIS

Takes place in the cytoplasm of the cell and is common to both aerobic and anaerobic respiration.

glycolysis means literally that glucose is split and the 6 carbon glucose molecule is broken down to 2 X 3carbon molecules of Pyruvic acid. This produces a net gain of 2 ATP molecules.

If oxygen is absent (anaerobic) in animal cells, such as muscle, 3C Pyruvic acid is converted to lactic acid.

In plant cells, such as yeast, pyruvic acid is converted to 2C Ethanol + CO2 (fermentation)

In both of the above only 2 ATP molecules are produced per glucose molecule respired.

If oxygen is present (aerobic), pyruvic acid enters the mitochondrion to the fluid matrix where Kreb's cycle stages occur.

During Kreb's cycle Citric acid is initially formed and is then broken down in a series of enzyme controlled rections releasing CO2 (waste product) and hydrogen.

Hydrogen is picked up by a hydrogen carrier molecule called NAD and transported to the hydrogen carrier sytem (Cytochrome sytem) on the cristae of the mitochondrion for the final stage of respiration.

Cytochrome system- electron transport system:

Hydrogen is passed along a chain of hydrogen carrier molecules by a series of oxidation and reduction reactions.

each time a hydrogen molecule is passed along, a molecule of ATP is produced from ADP and phosphate.

The final Hydrogen acceptor is oxygen and produces a molecule of water (the other waste product).

In all, 36 ATP molecules are generated during the Cytochrome system, making a total of 38 ATP (36 from cytochrome system + 2 ATP from glycolysis) produced when Glucose is respired aerobically.

This makes aerobic respiration 19X more efficient at producing ATP than anaerobic respiration.

Hope this helps!

Answer 2

There are 3 main stages - Glycolysis, The Krebs cycle and the Electron Transport system.

Basically, glycolysis converts glucose to pyruvate (3-carbon) for use in the Krebs cycle.

The Krebs cycle is an endless chain, but its main function is to free H(plus) ions from NADPH.

These H ions go on to the electron transport chain, where they are split into electrons and protons, and the electrons are passed down a series of carriers, down energy levels. At each energy level the energy released is captured forming ATP from ADP and Pi.

The hydrogen is recombined and added to oxygen to create water.

Of course, this process is a million times more complicated than this, but here's a general overview :)

Answer 3

It's actually four steps. The first is glycolysis where the glucose is broken down. The seconds is a transition phase where pyruvate is combines with Coenzyme A (Co-A). The third is the Krebs cycle where the concentration gradient is formed. And the forth is the Electron Transport Chain where 90% of the ATP is synthesized.

Answer 4

Actually there are 4 steps of aerobic cellular respiration

Glycolysis, Oxidative decarboxylation of pyruvate, kreb's cycle, electrton transport chain

Answer 5

Glycolysis, TCA cycle, and electron transport chain