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Tricarboxylic Acid Cycle (TCA) Quiz

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Questions and Answers

Which enzyme catalyzes the condensation of acetyl group with oxaloacetic acid to form citric acid in the TCA cycle?

Citrate synthase

What is the summary equation of the Krebs’ cycle in terms of the products generated from the breakdown of a glucose molecule?

6 CO2, 8 NADH+H+, 2 FADH2, 2 ATP

How are electrons transferred from NADH to ubiquinone in the electron transport chain?

Electrons are transferred from NADH to ubiquinone through NADH dehydrogenase (complex I) and FADH2 (generated in the citric acid cycle) in complex II.

What role does cytochrome c play in the electron transport chain?

Cytochrome c acts as a mobile carrier of electrons between complex III and IV. Signup and view all the answers

What is the function of the Electron Transport System (ETS) in relation to the TCA cycle?

To release and utilize energy stored in NADH+H+ and FADH2 by oxidation Signup and view all the answers

How is ATP produced during the electron transport chain?

ATP is produced through the coupling of electron transfer from complexes I-IV to ATP synthase (complex V). Signup and view all the answers

What is the respiratory quotient (RQ) for carbohydrates and why is it equal to 1?

1 Signup and view all the answers

What is the respiratory quotient (RQ) for proteins and why is it 0.9?

0.9 Signup and view all the answers

Why is the respiratory quotient (RQ) for fats typically less than 1?

Less than 1 Signup and view all the answers

Why are pure proteins or fats not used as respiratory substrates in living organisms?

Not used Signup and view all the answers