Krebs Cycle Overview Quiz

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Why is the Krebs cycle described as an amphibolic pathway?

It involves both catabolism (energy release) and anabolism (synthesis of molecules like fatty acids, glutamic acid, and aspartic acid).

What is the main purpose of the Krebs cycle?

Step-wise oxidation of acetyl part of acetyl CoA leading to the release of energy and CO₂

What are the main products released during the Krebs cycle?

Energy and CO₂

What is the precursor used for the synthesis of fatty acids in the Krebs cycle?

Acetyl CoA or some other intermediates like a-ketoglutarate

Which part of the Krebs cycle involves oxidative decarboxylation?

Oxidative decarboxylation occurs in the step where acetyl CoA is converted to citrate.

What is the role of the Electron Transport chain in cellular respiration?

To transfer electrons and generate ATP through oxidative phosphorylation.

Study Notes

The Krebs Cycle: Amphibolic Pathway and Key Products

  • The Krebs cycle is described as an amphibolic pathway because it serves as a bridge between catabolic and anabolic pathways, involving both the breakdown of energy sources and the synthesis of new molecules.

Main Purpose and Products

  • The main purpose of the Krebs cycle is to generate energy for the cell in the form of ATP, NADH, and FADH2, as well as to produce carbon skeletons for various biosynthetic pathways.
  • The main products released during the Krebs cycle are ATP, NADH, FADH2, and CO2.

Fatty Acid Synthesis

  • The precursor used for the synthesis of fatty acids in the Krebs cycle is citrate, which is converted to acetyl-CoA and oxaloacetate.

Oxidative Decarboxylation

  • The part of the Krebs cycle that involves oxidative decarboxylation is the conversion of α-ketoglutarate to succinyl-CoA, which leads to the release of CO2 and the formation of NADH.

Electron Transport Chain

  • The role of the Electron Transport chain in cellular respiration is to generate ATP by harnessing the energy released from the electron transport of high-energy electrons from NADH and FADH2 to oxygen.

Test your knowledge on the Krebs cycle, a key component of aerobic respiration. This quiz covers concepts such as enzymes involved, reactions, and the generation of ATP.

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