Redox and Free Energy Flashcards

1
Q

What is an OMC?

A

Outer membrane multi-haem cytochrome

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2
Q

In some bacterial cells what plays a key role in electron conduction between the cell and a material/electrose?

A

Outer membrane multi-haem cytochromes

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3
Q

How are multi-haem cytochromes thought to help electron conduction?

A

They act as a scaffold for a ‘wire’ of haem groups

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4
Q

How do some species of bacteria deliver elecrons to/from substrates?

A

Through long protruding ‘nanowires’

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5
Q

In G.sulfurreductens what make up the protruding nanowires?

A
  • Type IV Protein Pili with stacked aromatic amino acids that provide conductivity
  • Attached cytochromes to reduce Iron
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6
Q

How can the direction of electron flow between 2 redox couples be predicted?

A

By comparing the values of Eº1

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7
Q

Where are negative potentials on plots of Eº1 ?

A

At the top

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8
Q

What is the faraday constant?

A

The amount of electric charge per mole of electrons

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9
Q

What affects the free energy change for a redox reaction?

A

Its direction

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10
Q

What shape plot is produced if E is plotted against the % of the redox couple in the reduced state?

A

A sigmoidal plot

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11
Q

What is Em?

A

E when [ox]=[red] and has the same value as the standard reduction potential Eº

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12
Q

How can n be determined by plotting the Nerst equation?

A

The slope of the line

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13
Q

How can Em be determined from a plot of the Nerst equation?

A

The y intercept

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