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Answered

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which product of the electron transport chain reenters the krebs cycle?
A. ATP
B. CoA
C. NAD+
D. NADH
E. pyruvate

Sagot :

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Answer:

C. NAD+

Explanation:

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The Krebs Cycle requires NAD+ and FAD+ from the electron transport chain and operates thanks to several different enzymes that completely oxidize Acetyl-CoA.

Aerobic respiration takes place in two stages: the Krebs cycle and electron transport and oxidative phosphorylation (these last two processes occur in a coupled manner).

  • The Krebs cycle takes place in the mitochondria and allows carbohydrates, lipids and amino acids to be completely oxidized, producing a large amount of metabolic energy.

  • For the cycle to begin, it needs to acetyl-CoA, coming from the degradation of more complex molecules, to give rise to citric acid.

  • In the electron transport chain each molecule of NADH becomes 3 ATP (2 NADH x 3 = 6 ATP).

  • The conversion of pyruvic acid to AcetylCoA in the mitochondrial matrix yields 2 NADH for each glucose molecule. (2 NADH x 3 ATP = 6 ATP).

  • Two molecules of acetyl-CoA enter the Krebs cycle and give two of GTP and 6 NADH and 2 FADH2.

Therefore, we can conclude that the Krebs Cycle is a fundamental process that occurs in the matrix of cellular mitochondria, and that it consists of the release of the chemical energy contained in Acetyl-CoA.

Learn more about the Krebs Cycle here: https://brainly.com/question/9970063

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