AP Biology Unit 3 Krebs Cycle

Front

What is the role of NADH in the Krebs cycle?

Back

NADH acts as an electron carrier, transporting high-energy electrons to the electron transport chain for ATP production.

Front

What is the role of FADH₂ in the Krebs cycle?

Back

FADH₂ is another electron carrier that transports electrons to the electron transport chain, but it contributes less energy compared to NADH.

Front

How many ATP molecules are produced from one glucose molecule during the Krebs cycle?

Back

The Krebs cycle itself produces 2 ATP molecules per glucose molecule.

Front

What is the significance of oxygen in the Krebs cycle?

Back

Oxygen is essential for the oxidation of NADH to NAD+, allowing the Krebs cycle to continue.

Front

Where does the Krebs cycle occur in the cell?

Back

The Krebs cycle takes place in the mitochondrial matrix.

Front

What are the main products of one turn of the Krebs cycle?

Back

1 ATP, 3 NADH, 1 FADH₂, and 2 CO₂.

Front

What is the starting molecule for the Krebs cycle?

Back

The starting molecule is Acetyl CoA, which is derived from pyruvate.

Front

What happens to the carbon atoms in Acetyl CoA during the Krebs cycle?

Back

The carbon atoms are released as carbon dioxide (CO₂) during the cycle.

Front

How many times does the Krebs cycle turn for each glucose molecule?

Back

The Krebs cycle turns twice for each glucose molecule.

Front

What is substrate-level phosphorylation in the context of the Krebs cycle?

Back

Substrate-level phosphorylation is the direct synthesis of ATP from ADP and a phosphate group during the Krebs cycle.