What form of transport is electron transport chain -what happens to the carbons

Question

What form of transport is electron transport chain

-what happens to the carbons in the citric acid cycle

-Define the reactions in the The citric acid cycle

What is the fate of the acetyl carbon atoms in the citric acid cycle

Describe the roles of NAD and FAD.

Explain why the citric cycle acts as a multistep catalyst.

Identify the points where energy is conserved as NADH, FADH2, or GTP

What form of transport is electron transport chain

Why isn’t oxidative phosphorylation always the preferred source of ATP?

Explanation / Answer

What form of transport is electron transport chain:

When electrons flow down the energy gradient from NADH to O2, the four protein complexes that catalyze the redox reaction are:

Complex I: NADH-Q reductase complex- In Complex I, two electrons are removed from NADH and transferred to a lipid-soluble carrier, ubiquinone (Q).

Complex III: Cytochrome c reductase complex-. Two electrons are removed from QH2 at the QO site and sequentially transferred to two molecules of cytochrome c, a water-soluble electron carrier located within the intermembrane space

Cyt C: Cytochrome c

Complex IV: Cytochrome c oxidase complex- four electrons are removed from four molecules of cytochrome c and transferred to molecular oxygen (O2), producing two molecules of water

When electrons flow down the energy gradient from FADH2 to O2, the four protein complexes that catalyze the redox reaction are:

Complex II: succinate dehydrogenase- additional electrons are delivered into the quinone pool (Q) originating from succinate and transferred (via FAD) to Q

Complex III: Cytochrome c reductase complex

Cyt C: Cytochrome c

Complex IV: Cytochrome c oxidase complex.

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Define the reactions in the The citric acid cycle:

The citric acid cycle is a pathway that continues the breakdown of glucose and produces 2 molecules of adenosine triphosphate (ATP). This process occurs only in the presence of oxygen but is not involved in recycling of nicotinamide adenine dinucleotide (NAD+).

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