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TCA cycle and ETC Quiz

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Questions and Answers

What is the main purpose of the Electron Transport Chain (ETC) in cellular respiration?

To use NADH and FADH2 to concentrate H+ protons in the intermembrane space (correct)

To convert pyruvate into Acetyl-CoA

To generate NADH and FADH2 from the TCA cycle

To produce ATP directly from the oxidation of glucose

Which molecule is produced during the conversion of pyruvate to Acetyl-CoA?

CO2

FADH2

ATP

NADH (correct)

What is the primary energy source for the Electron Transport Chain (ETC)?

Pyruvate

Glucose

ATP

NADH and FADH2 (correct)

What is the role of beta oxidation in cellular respiration?

To produce Acetyl-CoA from fatty acids Signup and view all the answers

What is the function of Complex I in the electron transport chain?

Receive 2 electrons from NADH and pass them to CoQ, while pumping 4 H+ Signup and view all the answers

What is the role of Coenzyme Q (CoQ) in the electron transport chain?

It is a lipid-like carrier that receives electrons from Complex I and Complex II Signup and view all the answers

What is the function of Complex II in the electron transport chain?

Receive 2 electrons from succinate and pass them directly to FADH2 Signup and view all the answers

What is the function of Complex III in the electron transport chain?

Receive 2 electrons from CoQ and pass them to Cytochrome C, while pumping 4 H+ Signup and view all the answers

What is the function of Complex IV in the electron transport chain?

Receive 2 electrons from Cytochrome C and pass them to Oxygen, while pumping 2 H+ Signup and view all the answers

Where are the structural changes in Complex I directing H+ to move through translocation half-channels?

Matrix Signup and view all the answers

What forms supramolecular assemblies or supercomplexes in the electron transport chain?

The ETC Signup and view all the answers

What is the power source for the ATP synthase to convert H+ gradient into ATP?

Difference in the concentration of H+ on opposite sides of the inner mitochondrial membrane Signup and view all the answers

Study Notes

Electron Transport Chain (ETC)

The main purpose of the ETC is to generate ATP during cellular respiration.
The primary energy source for the ETC is the proton gradient generated by the transfer of electrons.

Conversion of Pyruvate to Acetyl-CoA

The molecule produced during the conversion of pyruvate to Acetyl-CoA is CO2.

Beta Oxidation

The role of beta oxidation in cellular respiration is to break down fatty acids into Acetyl-CoA.

Complexes of the Electron Transport Chain

Complex I: also known as NADH dehydrogenase, it transfers electrons from NADH to CoQ and generates a proton gradient.
Complex II: also known as succinate dehydrogenase, it transfers electrons from succinate to CoQ and does not generate a proton gradient.
Complex III: also known as cytochrome b-c1 complex, it transfers electrons from CoQ to cytochrome c and generates a proton gradient.
Complex IV: also known as cytochrome c oxidase, it transfers electrons from cytochrome c to oxygen and generates a proton gradient.

Proton Translocation

The structural changes in Complex I direct H+ to move through translocation half-channels.

Supramolecular Assemblies

Supramolecular assemblies or supercomplexes are formed by the complexes of the electron transport chain.

ATP Synthesis

The power source for the ATP synthase to convert H+ gradient into ATP is the proton gradient generated by the ETC.

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Description

Test your knowledge of the electron transport chain, TCA cycle, and metabolic pathways in this BIOL2020 lecture 9 quiz. Explore the role of amino acids, sugars, and lipids in feeding into the TCA cycle and understand the processes of glycolysis, oxidation of glucose, and the production of ATP. Challenge yourself with questions about key components such as pyruvate dehydrogenase, acetyl-CoA, NADH, and FADH