You have recently discovered an organism that uses the sun’s energy to strip electrons from hydrogen sulfide, and uses the resultant energy to build organic molecules from sugars and proteins.Based on this description, you would class this organism as a:单项选择题
A
a. Chemoautotroph.
B
b. Chemoheterotroph.
C
c. Photoautotroph.
D
d. Photoheterotroph.

Question

You have recently discovered an organism that uses the sun’s energy to strip electrons from hydrogen sulfide, and uses the resultant energy to build organic molecules from sugars and proteins.Based on this description, you would class this organism as a:单项选择题

A

a. Chemoautotroph.

B

b. Chemoheterotroph.

C

c. Photoautotroph.

D

d. Photoheterotroph.

BlackTom AI · Accepted Answer

Light as the energy source (photo-) combined with organic molecules as the carbon source (heterotrophy) defines a photoheterotroph.

1) Relevant concepts
- Energy source: "photo-" organisms use light; "chemo-" organisms use chemical compounds.
- Electron source: "litho-" means inorganic electron donors (e.g., H2S, H2), "organo-" means organic electron donors.
- Carbon source: "autotroph" fixes CO2 to build biomass; "heterotroph" uses preformed organic compounds (sugars, proteins) as carbon sources.
- Many classification labels combine these (e.g., photolithoautotroph), but in standard MCQ form the primary pair is energy and carbon source: photoautotroph vs photoheterotroph, chemoautotroph vs chemoheterotroph.

2) Step-by-step reasoning
- The organism “uses the sun’s energy” → energy source = light → prefix = photo-.
- It “strips electrons from hydrogen sulfide (H2S)” → electron donor is inorganic (lithotrophy) and indicates anoxygenic phototrophy (common in certain bacteria), but this detail affects the electron-source term, not the energy/carbon classification asked.
- It “builds organic molecules from sugars and proteins” → carbon source = organic compounds → trophic carbon classification = heterotroph.

3) Intermediate classification step
- Combine energy and carbon designations: photo- (light) + heterotroph (organic carbon) → photoheterotroph.
- More detailed label could be photolithoheterotroph (photo = light energy, litho = inorganic electron donor H2S, heterotroph = organic carbon), but the multiple-choice option offered is photoheterotroph.

4) Why the correct answer is correct
- The organism uses light for energy and uses organic molecules (sugars, proteins) as the carbon source, which directly matches the definition of a photoheterotroph.

5) Why the other options are incorrect
- a. Chemoautotroph: would use chemical energy and fix CO2 (not light and not organic carbon) — incorrect.
- b. Chemoheterotroph: uses chemical energy and organic carbon (not light) — incorrect.
- c. Photoautotroph: uses light but fixes CO2 as carbon source; here the organism uses organic sugars/proteins, so it is not autotrophic — incorrect.

6) Conclusion
- Therefore the correct classification is d. Photoheterotroph, which matches the provided answer.

You have recently discovered an organism that uses the sun’s energy to strip electrons from hydrogen sulfide, and uses the resultant energy to build organic molecules from sugars and proteins.Based on this description, you would class this organism as a:单项选择题

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