How does a carbon atom in glucose become a carbon atom in CO2 when it is in a root cell of a bean plant?

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Why do fish in the ocean add carbon dioxide to the water they live in?

When a rabbit eats a starch molecule in a carrot, how does the glucose molecule get to a muscle cell in the rabbit's leg?

what is the relationship between glucose and starch in a photosynthetic leaf?

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Answer 1

Glucose is metabolized by the processes of glycolysis and the Krebs cycle in all aerobic organisms like the bean plant.  This is a complex series of organic conversions that you can find in many textbooks.  The result is the complete conversion of glucose to H2O and CO2.

Fish being aerobic organisms will metabolize carbohydrate in their food to H2O and CO2, just like the bean root cell.  So, they add CO2 to the water they live in.

In the rabbit, glucose is transported to muscle tissue via the bloodstream.

Glucose and starch in the photosynthetic leaf are very closely related.  Starch is simply a polymer of glucose units.  A polymer is the chemical term for a molecule made up of indentical units like beads on a necklace.