MDCAT Biology MCQ #538

MDCAT Biology MCQ #538

1. Question 1

   Q1. During intense light exposure, a plant switches from non-cyclic to cyclic photophosphorylation. What product will be missing after this shift?

   • A) Formation of a proton gradient across the thylakoid membrane
   • B) Excitation of electrons by photons of light energy
   • C) Production of reducing power in the form of NADPH
   • D) Transfer of electrons through a cytochrome complex

   Answer: Production of reducing power in the form of NADPH

   Explanation: Cyclic flow only produces ATP using PS I, while non-cyclic produces both ATP and NADPH using both photosystems.