Question

If carbon dioxide and water were abundantly available to a heterotrophic prokaryotic cell, would it be possible for the cell to use them as a food source?

Answer 1

If carbon dioxide and water were abundantly available, a heterotrophic prokaryotic cell would not be able to use them as a source of food. 
This is because, heterotrophic prokaryotic cells can only use carbon from organic compounds as food; they can not fix raw carbon.

Answer 2

Answer:

No, it would be impossible

Explanation:

Heterotrophs are so called because they cannot synthesize their own food, they depend on an external source. The synthesis of food is unique to a particular set of organisms called AUTOTROPHS. They have the ability to capture the energy from sunlight using pigments called CHLOROPHYLL and use this energy to synthesize their food in their Chloroplast. This process is called PHOTOSYNTHESIS. Autotophs combine CO2 and H2O (water) to produce glucose (organic molecule).

Heterotrophs like animals, do not possess this ability to capture sunlight energy or fix carbon to produce their food. Hence, in an abundance of CO2 and water, their cells would be unable to utilize these molecules, as only the Chloroplast of autotophs can undergo this process.