Abiologist examines a single-celled organism isolated from a hot spring. the organism is a photosynthetic halophile that uses the pigment bacteriorhodopsin. in which kingdom should the biologist classify the organism? a.  bacteriab.  protistac.  fungid.  archaea

The right answer is D. Archaea.

Bacteriorhodopsin is a transmembrane protein, formed of seven helices, inserted into the walls of certain bacteria such as Halobacterium salinarum. Bacteriorhodopsin has a chromophore, retinal, which allows it to convert light energy into chemical energy (photosynthesis).

It serves as a model for proton pumps controlled by light. It is well studied for its bioenergetic properties and as a possible data storage medium.

By the way, Halobacterium salinarum is a species of aerobic halophilic archaea (not part of the kingdom of bacteria but archaea) found in environments with high salt content such as salted fish and various foods rich in salt , the salt marshes or the salt lakes

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