Question

Purple sulfur bacteria and filamentous sulfur-oxidizers both A. accumulate sulfur as intracellular granules.B. fix nitrogen.C. produce oxygen from carbon dioxide.D. use gliding motility.

Answer 1

Option A, accumulate sulfur as intracellular granules.

Step-by-step explanation:

Purple sulfur bacteria belong to the group of Proteobacteria. These probacterias are anaerobic in nature and yet are able to photosynthesise. They are usually found in water environments such as hot springs, stagnant water etc. They use sulphur (either in the form of sulfide, or thiosulfate) as an electron donor in their photosynthetic activity to oxidise sulfur thereby producing granules of elemental sulfur.

while filamentous sulfur oxidizers use nitrate instead of oxygen to oxidize sulfide thereby producing granules.

Hence, option A is correct.