Multiple choice

The pentose sugar essential for photosynthetic mechanism is:

  1. ribose

  2. ribulose

  3. arabinose

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ribulose is the pentose sugar that forms the backbone of ribulose-1,5-bisphosphate (RuBP), the molecule that accepts carbon dioxide in the first step of the Calvin cycle. The enzyme RuBisCO catalyzes the carboxylation of RuBP, making it absolutely essential for carbon fixation in all photosynthetic organisms.

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