krebs cycle

Question 1

outline of krebs cycle

Answer 1

The Krebs cycle (sometimes called the citric acid cycle) consists of a series of enzyme-controlled reactions

Acetyl CoA (2C) enters the circular pathway via the link reaction

4 carbon (4C) oxaloacetate accepts the 2C acetyl fragment from acetyl CoA to form citrate (6C)

Citrate is then converted back to oxaloacetate through a series of small reactions

Question 2

steps in krebs cycle

Answer 2

1) Oxaloacetate is regenerated in the Krebs cycle through a series of reactions

2) Decarboxylation of citrate
Releasing 2 CO2 as waste gas

3) Dehydrogenation of citrate Releasing H atoms that reduce coenzymes NAD and FAD
8H + 3NAD + FAD → 3NADH + 3H+ + FADH2

4) Substrate-level phosphorylation A phosphate is transferred from one of the intermediates to ADP, forming 1 ATP