Question

What is the difference between positive and negative feedback?

What is the difference between an endergonic and exergonic reaction?

What's needed to go on to kreb cycle, what's need to go into electron transport chain?

What are the end products and amount for glycolysis, krebs cycle and electron transport chain?

(in detail- thanks)

Answer 1

3. Pyruvic acid generated through glycolysis, undergo oxidative decarboxylation in the presence of NADH dehydrogenase complex to form acetyl CoA. This is a 2 carbon compound and it is accepted by oxaloacetate which is a 4 carbon compound. In electron transport chain, electrons generated by NADH and FADH2 in glycolysis and Krebs cycle reached oxygen to produce water and ATP.

End product of glycolysis is pyruvic acid by the use of 2 ATP. End product of Krebs cycle is malic acid and by the use of 0 ATP. Electron transport chain resulted in the formation of water molecules and ATP. The electron generated from NADH2 and FADH2 is used in electron transport chain.

In endergonic reaction, energy is released into the surrounding whereas in exergonic reaction, energy is used to perform the reaction.

When any of the substance in a particular pathway increases the rate of reaction is a positive feedback and when the substance in a particular pathway decreases the rate of reaction it is called negative feedback.