Answer Happy

The light reactions of Photosynthesis: 2NADP+ + 2H+ + 2H2O + 3ADP + 3Pi→ O2 + 4H+ + 2NADPH + 3ATP



In the overall mass balance equation for the light
reactions shown above, identify the source of electrons
for the synthesis of NADPH.
Is this equation describing cyclic or non-cyclic
photosynthesis? Explain.
How many electrons are transferred (to form 1
dioxygen O2) in the reaction above?
The redox potential of water/oxygen = +0.82 V while for NADP/H
= -0.32 V. Calculate the standard free energy of the
photosynthetic electron transport chain. F = Faraday constant =
96,000 J/volt*mol (use n=2). Is electron transport in
photosynthesis itself spontaneous? If not, where does the energy
coupled to drive photosynthetic electron transport come from?
Given that the free energy change for the hydrolysis of ATP is
-31.5 kJ/mole and the free energy change for the oxidation of NADPH
to NADP+ is
-18 kJ/mole, calculate the total production of
free energy from the light reactions.
What is the minimum free energy change per
electron to accomplish both electron transport and ATP/NADPH
synthesis?