Question

Classify each prokaryote example as a phototroph, chemoorganotroph, or chemolithotroph.

1- proteobacteria that contain bacteriochlorophylls

2- bacteria that synthesize organic compounds from water and sunlight

3- symbiotic nitrogen-fixing bacteria that live in root nodules

4- an obligate intracellular parasite that obtains energy from its host

5- a swamp archaea that oxidizes hydrogen

6- an extreme thermophile that metabolizes sulfur

Answer 1

1. Proteobacteria containing bacteriochlorophyll are the phototroph purple bacteria having photosystem second type of photosynthetic apparatus.It includes Rhodobacter , Rhodospirillum , Chromatin etc.

2. Bacteria that synthesized organic compound like starch by the process of photosynthesis using water and sunlight are the phototroph.

3. Symbiotic nitrogen fixing bacteria are symbiotic heterotrophs that convert atmospheric nitrogen in to nitrate during nitrogen fixation like Rhizobium.

4. They are heterotrophic parasitic pathogenic bacteria that causes disease like mycobacterium leprae.

5. These are the methanogenic bacteria present in swamps and convert carbondioxide into methane like methanococcus bacteria.

6. These are the thermoacidophil bacteria present in hot sulphur springs. It oxidised sulphur to sulphuric acid and obtain energy.