Algae have photosynthetic machinery ultimately derived from cyanobacteria that produce oxygen as a by-product of photosynthesis, unlike other photosynthetic bacteria such as purple and green sulfur bacteria.
ˈælɡiː hæv fˌoʊɾoʊsɪnθˈɛɾɪk məʃˈiːnɚɹi ˈʌltᵻmətli dᵻɹˈaɪvd fɹʌm sˌaɪɐnˌɑːbɐktˈɪɹiə ðæt pɹədˈuːs ˈɑːksɪdʒən æz ɐ baɪpɹˈɑːdʌkt ʌv fˌoʊɾoʊsˈɪnθəsˌɪs, ʌnlˈaɪk ˈʌðɚ fˌoʊɾoʊsɪnθˈɛɾɪk bæktˈɪɹiə sˈʌtʃ ɐz pˈɜːpəl ænd ɡɹˈiːn sˈʌlfɜː bæktˈɪɹiə.