Exemplar Problems

Question:

  1. 3CO2 + 9ATP + 6NADPH + Water glyceraldehyde 3 – phosphate + 9 ADP + 6 NADP+ + 8 Pi

Analyse the above reaction and answer the following questions:

a. How many molecules of ATP & NADPH are required to fix one molecule of CO2?

b. Where in the chloroplast does this process occur?

Answer:

(a) 3 molecules of ATP (2 ATP used for the conversion of 3-phosphoglyceric acid to 1-3 bisphosphoglyceric acid and 1 ATP used for the regeneration of the RuBP.) and 2 molecules of NADPH (during conversion of 1-3 bisphosphoglyceric acid to 3 phosphoglyceraldehyde) are required for reduction of carbon dioxide.

(b) Calin cycle occurs in the stroma of the chloroplast.

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