Krebs Cycle

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4 Terms

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How many times does the Krebs cycle occur per one molecule of glucose?

Twice per one molecule of glucose

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Where does the Krebs cycle occur?

Matrix

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The Krebs Cycle Process

  1. Acetyl CoA brings acetate from the link reaction.

    The Acetate binds to oxaloacetate to form citrate.

    CoA then goes back to the link reaction to pick up more acetate to bring to the Krebs cycle.

  2. The citrate is a 6C compound, and it has 1 carbon removed from it (decarboxylated) to produce CO2.

    The citrate also has a hydrogen removed, so dehydrogenation has occurred, forming reduced NAD.

    A 5C compound is formed.

  3. The 5C compound has 1 carbon removed (decarboxylated) to form CO2.

    A hydrogen is removed from the 5C compound and added to NAD to form reduced NAD. Dehydrogenation has occurred.

    ATP is formed through substrate-level phosphorylation

    Further dehydrogenation occurs, as a coenzyme FAD will take a hydrogen electron from the 5C compound to form reduced FAD.

    Another molecule of NAD is reduced, as it gains a hydrogen electron from the 5C compound. Further dehydrogenation occurring here.

    This forms oxaloacetate (4C).

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Overall products from Krebs cycle per 1 molecule of glucose

CO2 = 4

reduced NAD = 6

reduced FAD = 2

ATP = 2