High School

13. Which order of molecular conversions is correct for the Calvin cycle?

A. RuBP + G3P → 3-PGA → sugar
B. RuBisCO → CO₂ → RuBP → G3P
C. RuBP + CO₂ → [RuBisCO] 3-PGA → G3P
D. CO₂ → 3-PGA → RuBP → G3P

Answer :

The correct order of molecular conversions for the Calvin cycle is (c) RuBP + CO₂ → [RuBisCO] 3-PGA → G₃P.

The Calvin cycle is a complex biochemical process that occurs in the stroma of chloroplasts in plants. It is responsible for converting carbon dioxide and water into organic molecules such as glucose, using energy from light captured by chlorophyll. The first step involves the fixation of carbon dioxide onto ribulose-1,5-bisphosphate (RuBP) to form an unstable intermediate that rapidly breaks down into two molecules of 3-phosphoglyceric acid (3-PGA).

The next step involves the reduction of 3-PGA into glyceraldehyde-3-phosphate (G₃P) using ATP and NADPH generated during the light-dependent reactions. Finally, some of the G₃P molecules are used to regenerate RuBP, while others are exported out of the chloroplast and used to synthesize glucose and other sugars.

To learn more about molecular conversions refer to:

brainly.com/question/30037535

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