MDCAT Biology MCQ #549

In the Calvin cycle, 3-phosphoglycerate (3-PGA) is converted to Glyceraldehyde-3-phosphate (G3P). What is the critical difference between these two trioses?

MDCAT Biology MCQ #549

  1. Question 1

    Q1. In the Calvin cycle, 3-phosphoglycerate (3-PGA) is converted to Glyceraldehyde-3-phosphate (G3P). What is the critical difference between these two trioses?

    • A) The number of carbon atoms in the backbone
    • B) The energy content and reduction state
    • C) The presence of a phosphate group
    • D) The ability to be recycled into RuBP

    Answer: The energy content and reduction state

    Explanation: G3P is more reduced and higher in energy than 3-PGA because it has been energized by ATP and NADPH.