Assalam-u-Alaikum
Welcome to another biology lecture
and today we will dicuss Kreb's Cycle
Kreb's cycle is also called TCA (TriCarboxylic Acid Cycle), and citric acid cycle.
All these terminologies are used for this cycle.
We call it kreb's cycle on Discovery of it's scientist name
We call it TCA because in this reaction production of citrate occur which contains three carboxyl groups.
And we also call this cycle Citric acid Cycle because in this cycle citric acid is produced.
So all these terminologies are used for this process
Kreb's cycle is the second step of cellular respiration if we are talking about aerobic respiration
Aerobic respiration has three steps - Glycolysis, Kreb's cycle and ETC. And kreb's cycle is the second process.
The first step of both aerobic and anaerobic respiration is glycolysis
So let's get into the board
In first step glucose is converted into two pyruvate molecules, means that six carbon molecule is converted into two three carbon molecule by the process of glycolysis
and glycolysis is common in both aerobic and anaerobic respiration
The process of glycolysis performed in cytoplasm and it need no oxygen and mitochondria
But If cell contains Mitochondria and oxygen is there then pyruvate molecules enter into the mitochondria and get ready for kreb's cycle
but before starting kreb's cycle they perform linked reaction which link glycolysis and kreb's cycle
In this reaction pyruvate convert into acetyl CoA molecule, mean that 3 carbon compound convert into 2 Carbon molecule.
and one molecule of CO2 released here
and that is what we see that in respiration CO2 produced as a waste product
