Question

13. When comparing and contrasting cellular respiration and photosynthesis, what do NADH and water have in common? A. They are both an initial supply of electrons for the series of redox reactions B. They both become oxidized gaining electrons in the process of being oxidized C. NADH reacts in the mitochondrial matrix while water initially reacts with photosystem II in the stroma D. Both water and NADH have higher available free energy than the intermediate in steps further along the process E. Both are the final products of the seri of redox reactions

Answer 1

Answer 13.

A. They are both an initial supply of electrons for the series of redox reactions.

NADH is produced from NAD+(oxidised form) during the kreb cycle by picking up electron from glucose molecules. Then the reduced form NADH is used in cellular respiration to deliver electrons to the electron transport chain and to pump proton across the membrane and generate electrochemical gradient. And during photosynthesis water splits into oxygen and H+ by photolysis. And also water provide electrons to the photosystem to transport electron through the complexes and reduce the NADP to NADPH. Then, NADPH will be used in carbon fixation.

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