Anonymous
Anonymous asked in Science & MathematicsBiology · 2 months ago

Ions (like H+) cannot diffuse down their concentration gradients through the plasma membrane using simple diffusion,?

Ions (like H+) cannot diffuse down their concentration gradients through the plasma membrane using simple diffusion, as they are "repelled" by the large nonpolar tail region.  Which statement best explains why this is important in both oxidative phosphorylation (in the mitochondrion) and photophosphorylation (in the chloroplast) ?   

In the mitochondrion, the electron carriers are NADH and FADH2.  In the chloroplast, there are fewer electron carriers.  Water provides a source of electrons in the chloroplast.

        

Both processes make use of an electron transport chain. In the electron transport chain, electrons are passed from carrier to carrier, as each carrier is initially reduced (gets the electrons) and then is oxidized (gives up the electrons).  The two processes have different final electron acceptors, however.

        

Both processes must occur across a membrane.

        

Both processes "harness" the potential energy of the H+ concentration gradient and use it to produce ATP.  If H+ could easily move through the membrane via simple diffusion, there would be no concentration gradient.

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  • ?
    Lv 7
    2 months ago

    Both processes "harness" the potential energy of the H+ concentration gradient and use it to produce ATP.  If H+ could easily move through the membrane via simple diffusion, there would be no concentration gradient.

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