AP BIO - Citric Acid Cycle (Krebs) 2024

Front

What is the main purpose of the Citric Acid Cycle (Krebs Cycle)?

Back

The main purpose of the Citric Acid Cycle is to generate energy through the oxidation of acetyl-CoA, producing NADH and FADH2 for the electron transport chain.

Front

Where does the Krebs Cycle occur in the cell?

Back

The Krebs Cycle occurs 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 role do enzymes play in the Krebs Cycle?

Back

Enzymes catalyze each step of the Krebs Cycle, facilitating the conversion of substrates into products.

Front

What is the significance of NADH and FADH2 produced in the Krebs Cycle?

Back

NADH and FADH2 carry high-energy electrons to the electron transport chain, where they are used to produce ATP.

Front

What happens to carbon atoms during the Krebs Cycle?

Back

Carbon atoms from acetyl-CoA are released as CO2 during the cycle.

Front

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

Back

The Krebs Cycle turns twice for each molecule of glucose, as one glucose molecule produces two acetyl-CoA.

Front

What is the initial substrate that enters the Krebs Cycle?

Back

The initial substrate that enters the Krebs Cycle is acetyl-CoA.

Front

What is the role of citrate in the Krebs Cycle?

Back

Citrate is formed when acetyl-CoA combines with oxaloacetate, marking the beginning of the Krebs Cycle.

Front

What is the difference between oxidation and reduction in the context of the Krebs Cycle?

Back

Oxidation involves the loss of electrons (e.g., malate is oxidized to oxaloacetate), while reduction involves the gain of electrons.