Green Sulfur Bacteria Are Often Found at the Greatest Depths

Multiple Choice

Green sulfur bacteria are often found at the greatest depths of all phototrophic cells in lakes, oceans, and microbial mats. This is because green sulfur bacteria

A) are very sensitive to UV irradiation, despite their reliance on light for energy.
B) are the only phototrophs that can use hydrogen sulfide as an electron donor for photosynthesis.
C) are strict anaerobes.
D) have chlorosomes that are very efficient at harvesting light, allowing them to perform photosynthesis where light intensities are very low.