Question

In green and purple bacteria, electrons to reduce Cl₃ can come from?

1) Cl₃
2) H₂O
3) C₆H₁₂O₆
4) H₂S
5) chlorophyll

Answer 1

In green and purple bacteria, electrons used to reduce compounds come from hydrogen sulfide (H2S) during the process of anoxygenic photosynthesis.

Step-by-step explanation:

The electrons to reduce Cl3 in green and purple bacteria can come from H2S (hydrogen sulfide). Purple sulfur bacteria, like those of the genus Chromatium, and green sulfur bacteria, like Chlorobium, use sulfide for oxidation in a process called anoxygenic photosynthesis. This type of photosynthesis does not produce oxygen but can release free elemental sulfur. These bacteria harbor multiple forms of bacteriochlorophylls and may also contain carotenoids giving them diverse colors and the ability to absorb various light wavelengths for photosynthesis.