Krebs cycle

Question 1

what is the starting molecule for the Krebs cycle?

Answer 1

acetyl coenzyme A from link reaction

Question 2

what is the first stage of the Krebs cycle from acetyl coenzyme A?

Answer 2

• acetyl coenzyme A (2 carbon molecule) reacts with a 4 carbon molecule called oxaloacetate to form citric acid (6 carbon molecule)
• using coenzyme A

Question 3

what is the second stage of the Krebs cycle from citric acid?

Answer 3

• loses CO2 to become 5 carbon molecule
• NAD becomes reduced NAD
• loses CO2 to become 4 carbon molecule

Question 4

what is the third stage of the Krebs cycle from the 4 carbon molecule?

Answer 4

• generates reduced coenzymes and ATP by phosphorylation
• ADP becomes ATP
• FAD becomes reduced FAD
• NAD becomes reduced NAD

Question 5

what are the products per Krebs cycle?

Answer 5

• 3 reduced NAD
• 1 reduced FAD
• 1 ATP
• 2 CO2

Question 6

what are the products per glucose molecule?

Answer 6

• 6 reduced NAD
• 2 reduced FAD
• 2 ATP
• 4 CO2