The three-carbon carbohydrate that carbon dioxide is first fixed into is:
AGlucose sugar
BPyruvate acid
CG3P molecule
DRuBP molecule
Answer & Solution
Correct answer: C. G3P molecule
1. Carbon fixation does not produce glucose directly.
2. After a series of chemical reactions, the carbon from carbon dioxide in the atmosphere is fixed into carbohydrates.
3. Specifically it becomes a three-carbon molecule called glyceraldehyde-3-phosphate, or G3P.
4. Glucose, the primary energy source in cells, is made from two three-carbon G3Ps.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 8 'Photosynthesis', sections 8.1-8.3_
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