Krebs cycle

Where does the Krebs cycle take place?

• Mitochondrial matrix

• Cytosol

• Cristae

• Outer membrane of mitochondria

All of the following are the products of pyruvate oxidation except?

• Acetyl CoA

• ATP

• NADH + H⁺

• CO₂

Pyruvate is ____________ before entering Krebs cycle

• oxidized

• reduced

• isomerized to Acetyl CoA

• phosphorylated

How many ATP molecules produced out of Krebs cycle?

• 2

• 4

• 6

• 0

How many FADH₂ molecules are produced by one molecule of glucose?

• 1

• 2

• 3

• 4

How many FADH₂ molecules are produced by two turns of the Krebs cycle?

• 1

• 2

• 3

• 4

_____ molecules of NADH are produced by a molecule of glucose through the Krebs cycle.

• 0

• 2

• 4

• 6

______ molecules of CO₂ are released by the Krebs cycle for a molecule of glucose.

• 0

• 2

• 4

• 6

How many carbon atoms remain from the original glucose after Krebs cycle?

• 0

• 2

• 4

• 6

Answer explanation

2 molecules of CO₂ removed during pyruvate oxidation, 4 molecules of CO₂ removed during Krebs cycle.

Folds in the inner mitochondrial membrane also known as

• Cristae

• Cisternae

• Matrix

• Stroma