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The first  CO_{2}  acceptor molecule which is a 5- Carbon sugar is

Option: 1

Phosphoglyceric acid


Option: 2

Ribulose bisphosphate (RuBP)


Option: 3

Enediol


Option: 4

oxaloacetic acid


Answers (1)

best_answer

 

 

 

The Primary Acceptor of CO2:

  • The acceptor molecule of CO2 is a 5-carbon ketose sugar – ribulose bisphosphate (RuBP). 
  • CO_{2} combines with RuBP to form an unstable 6C compound called enediol.
  • Enediol is quickly broken into two 3C compounds called 3-phosphoglyceric acid or in short PGA.
  • This is why the Calvin cycle is also called the C3 cycle.
  • Experiments conducted over a wide range of plants led to the discovery of another group of plants, where the first stable product of CO_{2} fixation was again an organic acid, but one which had 4 carbon atoms in it. 
  • This acid was identified to be oxaloacetic acid or OAA. 
  • These plants are said to perform C4 cycle.
  • However, Calvin pathway occurs in all photosynthetic plants.
     

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The primary CO_{2} acceptor molecule in dark reaction is RuBP. Hence, the correct answer is option b.

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