Origins
The chloroplasts of green algae are bound by a double membrane, so presumably they were acquired by direct endosymbiosis of cyanobacteria. A number of cyanobacteria show similar pigmentation (e.g., Prochloron), and cyanobacterial endosymbiosis appears to have arisen more than once, as in the Glaucophyta (Cyanophora) and red algae. Indeed, the green algae probably obtained their chloroplasts from a Prochloron-type prokaryotic ancestor, and evolved separately from the red algae.
Read more about this topic: Green Algae
Famous quotes containing the word origins:
“Lucretius
Sings his great theory of natural origins and of wise conduct; Plato
smiling carves dreams, bright cells
Of incorruptible wax to hive the Greek honey.”
—Robinson Jeffers (1887–1962)
“The settlement of America had its origins in the unsettlement of Europe. America came into existence when the European was already so distant from the ancient ideas and ways of his birthplace that the whole span of the Atlantic did not widen the gulf.”
—Lewis Mumford (1895–1990)
“The origins of clothing are not practical. They are mystical and erotic. The primitive man in the wolf-pelt was not keeping dry; he was saying: “Look what I killed. Aren’t I the best?””
—Katharine Hamnett (b. 1948)