A photon of light hitting PSI in the thylakoid membrane can lead to all of the f

Question

A photon of light hitting PSI in the thylakoid membrane can lead to all of the following EXCEPT: A) The splitting of water and the donation of its electrons to a special chlorophyll molecule in the reaction PSI. B) Absorbance of the photon by accessory chlorophyll molecules in PSI and passing of that absorbed energy other chlorophyll molecules within the PSI. C) The boosting of electrons contained in a special chlorophyll molecule to a higher energy sense which are subsequently passed to the primary electron acceptor of PSI. D) A redox reaction. E) There are no exceptions above. 4) Phosphofructokinase can be allosterically regulated under all of the following conditions EXCEPT: A) High rates of citrate formation. B) High rates of ATP hydrolysis. C) Low concentrations of ADP/AMP. D) Low concentrations of oxygen gas. E) There is more than one exception above.

Explanation / Answer

3. The first option is the exception in all depicted functions of PSI. The photosystem I does not split water the PSII splits water. Therefore, 1st is correct choice.

4. The option 5th - E is correct. Concentration of ADP/AMP does not regulate phosphofructokinase activity. It can increase ATP hydrolysis and hence indirectly can enhance ATP production. On the other hand, high rate of ATP hydrolysis does not regulate phosphofructokinase activity directly.

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