Multiple Choice
Which two nutrients do not provide energy for the body?
1. A Review of General Chemistry
Intro to Organic Chemistry
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What occurs during the carbon fixation step of the Calvin cycle in organic chemistry?
A
Carbon dioxide is incorporated into ribulose bisphosphate.
B
NADPH is oxidized to NADP+.
C
Carbon dioxide is converted into glucose.
D
ATP is synthesized from ADP and inorganic phosphate.
Verified step by step guidance1
Understand that the Calvin cycle is a series of biochemical reactions that occur in the stroma of chloroplasts in photosynthetic organisms.
Recognize that the carbon fixation step is the first phase of the Calvin cycle, where carbon dioxide (CO₂) is incorporated into an organic molecule.
Identify the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) as the catalyst for the reaction where CO₂ is fixed.
Note that during carbon fixation, CO₂ is added to ribulose bisphosphate (RuBP), a 5-carbon sugar, resulting in a 6-carbon intermediate that quickly splits into two molecules of 3-phosphoglycerate (3-PGA).
Acknowledge that this process does not involve the synthesis of ATP or the oxidation of NADPH; these occur in later stages of the Calvin cycle.
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