2. List the different types of electron carriers within the electron transport system. For every pair...

2. List the different types of electron carriers within the electron transport system. For every pair of electrons each complex transfers, determine how many protons are translocated.

Expert Solution

Electron carriers carry electrons(e-) only or electrons and hydrogen both.some of the electron carriers are:

1)cytochromes-only e-

2)iron-sulfur proteins- only e-

3)flavoproteins-both hydrogen and e-

4)Quinone proteins-both hydrogen and e-

Examples :

Cytochrome-c reductase,co-enzyme Q,etc..,

the elctron carriers in ETC form a copmlex.there are five complexes mentioned above.

=}For every pair of electrons,

1)The reaction,NADH to Q Pumps 4 protons across intermembrane space for 2e-. FADH2 gives elcetons to complex 2 to Q but no protons are pumped.

2)Q to cytochrome-C(complex-3),2 protons are pumped.

3)cytochrome-C oxidase to Oxygen,(complex-4) pumps 4protons.

Oxygen is the most electeonegative acceptor.

Hence a total no.of 10 protons are pumped for a pair of electrons or 1NADH molecule In ETC, which produce a overall of 2.5 ATP.

gladiator answered 1 year ago

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