The synthesis portion of photosynthesis is sometimes referred to as fixation; that is, the gas $CO_2$ is "fixed" into an organic molecule. Of the four major types of organic molecules, into which is $CO_2$ first fixed?

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The synthesis portion of photosynthesis is sometimes referred to as fixation; that is, the gas $CO_2$ is "fixed" into an organic molecule. Of the four major types of organic molecules, into which is $CO_2$ first fixed?

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Md Ariful Islam · Answer 1 · Apr 02, 2024 09:48:30

$CO_2$ taken in by the plant initially bonds to ribulose 1,5-biphosphate or $RuBP$ to form an unstable 6-carbon compound. This then divides into two three-carbon of glycerate 3-phosphate. With the addition of $ATP$ and $NADH_2$ for energy and oxidation, glycerate 3-phosphate becomes triose phosphate, which join into glucose, a sugar that is pivotal in biology.

Sugars are a form of carbohydrate, and often end in the suffix '-ose', though this is not systematic. Glucose and ribulose are the two examples here, both of which are sugars or sugar-containing molecules.

The synthesis portion of photosynthesis is sometimes referred to as fixation; that is, the gas $CO_2$ is "fixed" into an organic molecule. Of the four major types of organic molecules, into which is $CO_2$ first fixed?

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