They maintain a symbiotic relationship with cells. They are
symbionts.
All the cells in the human body contain mitochondria. Mitochondria are
more abundant in cells with heavy energy requirements, like muscle
cells.
A third type of such symbiont was recently discovered in the malaria
parasite, the Plasmodium falciparum. It is called an apicoplast and
is, perhaps, the remains of an alga. It, too, has its own unique
genome.
http://www.sas.upenn.edu/~striepen/apicoplast.html
http://directory.google.com/Top/Science/Biology/Genetics/Organelles
Oscars (Academy Awards)
Ben Hur (1959) and Titanic (1997) won 11 academy awards (Oscars) each.
Gigi (1958) and The Last Emperor (1987) were nominated for 9 awards
and won them all.
The Turning Point (1977) and The Color Purple (1985) were nominated
for 11 awards each, but didn't win even a single one.
Limelight (1952) by Charlie Chaplin won an Oscar for original dramatic
score only in 1973, a year after it was screened in Los Angeles for
the first time.
These winners were still shot in black and white. Notice the years:
Schindler's List (1993), The Apartment (1960) , Marty (1955), On the
Waterfront (1954), From Here to Eternity (1953).
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