E1 Electron Transport Chain Flashcards

1
Q

Where is the ETS located?

A

Inner mitochondrial membrane

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2
Q

What are the final products of aerobic metabolism?

A

CO2- Krebs

H20 and ATP- ETS

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3
Q

What part of the membrane is permeable to most small molecules and ions?

A

Outer membrane (mitochondrial porins)

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4
Q

What part of the membrane is impermeable to most ions and polar molecules? Why is this important?

A
Inner membrane (increase surface area)
(Requires transporters/shuttles to get through the membrane (ATP, pyruvate, citrate)
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5
Q

What does the matrix contain?

A

Enzymes, reactants, coenzymes, DNA, ribosomes, metabolic intermediates

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6
Q

Is NADH an electron acceptor or donor?

A

Donor

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7
Q

How is NAD+ reduced?

A

Dehydrogenases

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8
Q

When NAD+ is reduced, this removed 2 hydrogen atoms. One H is removed with 2e- as a ________ ion and the other is removed as the _______ ions.

A

Hydride (H-); positive (H+)

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9
Q

What is important for oxidative phosphorylation in ETS?

A

The electron-transfer potential of electron carriers (NADH, FADH2)

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10
Q

Define negative standard reduction potential.

A

Reducing agent (NADH) wants to donate electrons (-deltaE)

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11
Q

Define positive standard reduction potential.

A

Oxidizing agent (O2) wants to accept electrons. (+deltaE)

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12
Q

What is another name for complex 1?

A

NADH dehydrogenase

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13
Q

Does complex 1/NADH dehydrogenase have a proton pump?

A

Yes

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14
Q

Where does complex 1/NADH dehydrogenase receive electrons from?

A

NADH

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15
Q

What happens when complex 1 accepts electrons from NADH?

A

NADH binds to NADH dehydrogenase then to FMN and become FMNH2. FMNH2 donates 2 electrons to coenzyme Q/ubiquinone via iron/sulfur centers. FMN is recycled.

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16
Q

What is another name for complex 2?

A

Succinate dehydrogenase

17
Q

Where does complex 2/succinate dehydrogenase accept electrons from?

A

FADH2