Question

Aerobic respiration, Write Definition abut this.

Answer 1

Aerobic respiration is the process of producing cellular energy involving oxygen. Cells break down food in the mitochondria in a long, multistep process that produces roughly 36 ATP. The first step in is glycolysis, the second is the citric acid cycle and the third is the electron transport system.

~~~~~~~~~~Hope this helps~~~~~~~~~~

Answer 2

Hello buddy

Here we go

As we know respiration is mainly of two types depending upon presence of oxygen..

Now, it's about aerobic respiration..


Definition wise, The respiration which occurs in presence of oxygen is called as aerobic respiration

As its name suggested, aerobic respiration is cells breaking down sugar into energy and other waste with the presence of oxygen, or also known as what you are usually referring to when talking about cellular respiration. The overall process is as shown:

Organic compounds (i.e. glucose) + Oxygen -> Carbon dioxide + Water + Energy

There are three stages that the cell goes through, in which its details you can totally gloss over but I find it interesting to note where and when exactly the wastes are produced:

Glycolysis
Occurs in the cytosol, this is the first step in degrading glucose into an important carbon molecule called pyruvate. Each glucose yields two pyruvates and each process yields a net gain of 2 ATP (energy) and 2 NADH (electron carrier).

Pyruvate Oxidation and The Citric Acid Cycle (or Krebs Cycle, or Tricarboxylic Acid Cycle, you choose)
This wholly depends if there is sufficient oxygen present in the cell, because if there isn’t the cell would continue to fermentation instead. In aerobic respiration, the pyruvate produced by glycolysis would be oxidized to form acetyl CoA, with a CO2 and an NADH as it’s byproduct.
Then comes the Citric Acid Cycle, which starts off with a four carbon-containing molecule called oxaloacetate. As acetyl CoA comes in, it donates two more carbons. The cycle then must break this back down from six carbons to four by releasing it in the form of CO2, producing 1 ATP, 3 NADH, and 1 FADH2 (another electron carrier) on the way. (multiply this by 2 for the net gain, as there will be two acetyl CoA from glycolysis)
All this occur inside the mitochondria.

Oxidative Phosphorylation
Heading to the inner mitochondrial membrane there exists the electron transport chain and ATP synthase; the crème de la crème of ATP production and how the cell really harvests its energy. Everything the last two stages of cellular metabolism leads to this. Whilst the last two-three steps concentrated more into extracting energy in the form of NADH (and FADH2), this step will utilize all the energy carried by the two carriers into creating a whopping total of 28 ATP. And to this end, O2 is needed to stabilize the electrons and hydrogen ions from the electron transport chain and create good ol’ H2O.
The electron transport chain in itself does not make the ATP, but maintains the hydrogen ion gradient that powers the ATP synthase, which is responsible for producing ATP from ADP and a phosphate molecule. This relationship is called a coupled reaction.

Contrast to this are anaerobic respiration (in certain prokaryotes) and fermentation, when the cell does not use oxygen to break down molecules to harvest energy, consequently yielding less energy. So there you go, I probably geeked out a bit (a lot) when trying to list the stages of aerobic respiration but I hope this gives you your answer.