What is Purple bacteria?
'''Purple bacteria''' are [[bacteria]] that are [[phototroph]]ic, meaning that they are able to make [[Chemical energy|energy]] from [[Solar energy|light]]. They change the energy from the Sun into chemical energy that they can use to function. They do this through [[photosynthesis]].<ref name=bryantfrigaard>{{cite journal |author=D.A. Bryant & N.-U. Frigaard |date=November 2006 |title=Prokaryotic photosynthesis and phototrophy illuminated |journal=Trends Microbiol. |volume=14 |issue=11 |pages=488–496 |doi=10.1016/j.tim.2006.09.001 |pmid=16997562 }}</ref> Purple bacteria belong to the group called [[proteobacteria]]. They are called purple bacteria because they are often [[purple]] in colour. They can also be red, brown and orange. == References == {{reflist}} [[Category:Gram-negative bacteria]] {{Biology-stub}}