MDCAT Biology MCQ #546

MDCAT Biology MCQ #546

1. Question 1

   Q1. Comparing plant photosynthesis to that of green sulfur bacteria, what is the primary difference regarding the reducing agent used?

   • A) The type of chlorophyll used in the reaction center
   • B) The production of ATP through photophosphorylation
   • C) The source of electrons for the electron transport chain
   • D) The fixation of carbon dioxide into organic matter

   Answer: The source of electrons for the electron transport chain

   Explanation: Water is the electron donor in oxygenic photosynthesis (plants), while H2S is used in anoxygenic photosynthesis (sulfur bacteria).