sir please answer
Asked by minipkda
23rd May 2018,
6:11 AM
Answered by Expert
Answer:
(1)
There are four protein complexes (labeled complex I-IV) in the electron transport chain, which are involved in moving electrons from NADH and FADH2 to molecular oxygen.
- Complex I establishes the hydrogen ion gradient by pumping four hydrogen ions across the membrane from the matrix into the intermembrane space.
- Complex II receives FADH2, which bypasses complex I, and delivers electrons directly to the electron transport chain
- Complex III pumps protons through the membrane and passes its electrons to cytochrome c for transport to the fourth complex of proteins and enzymes.
- Complex IV reduces oxygen; the reduced oxygen then picks up two hydrogen ions from the surrounding medium to make water.
In Complex I and III, four protons across the membrane per pair of electrons are transferred and in Complex IV, two protons per pair of electrons are transported across the perimitochondrial membrane.
And two protons per pair of electrons are combined with oxygen to form water.
So, four protons enter into the peri-mitochondrial space from the matrix.
Answered by Expert
23rd May 2018,
9:22 AM
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