Carbon Cycle/Photosynthesis Flashcards
Where did carbon come from originally?
likely from star nucleosynthesis
this idea was established in 1957
Who was Messier?
an 18th century astronomer who listed over 100 objects in the sky that weren’t comets
what is the crab nebula M1? what does the M stand for?
it was most likely a star that exploded by a supernova ~900 years ago
M = Messier
why is the crab nebula M1 called a ‘visiting star’?
in 1024 AD when it likely exploded, there was a a very bright star visible during the day for 23 days and for 3 years in the night sky = the supernova
what is star/stellar nucleosynthesis?
the creation of chemical elements from the explosion of stars
What is the Bethe-Weizsacker cycle?
aka the CNO cycle - also a type of stellar nucleosynthesis
one of 2 fusion reactions that stars use to convert hydrogen to helium
caused the production of natural isotopes of C, N and O (both radioactive and stable)
What are examples of radioactive C and N isotopes?
C14, N13
Examples of stable C and N isotopes?
C13
N15
Where is the largest pool of carbon on earth?
coal, oil, etc. and sediments
Which phyla of bacteria are photosynthetic?
filamentous green bacteria (Chloroflexi)
Green sulfur bacteria (Chlorobi)
Firmicutes
Cyanobacteria
Proteobacteria
What is the most ancient known ancestor of photosynthetic bacteria?
Thermotoga
Which photosynthetic bacteria evolved first?
Chloroflexi (filamentous green bacteria)
Where in BC would you expect to find green sulfur bacteria (Chlorobi)?
in Lake Mahoney, where there’s high sulfur concentration
what is an example of Chlorobi (green sulfur bacteria) you’d expect to find in Lake Mahoney, BC?
Chlorobium (green)
What type of ecosystems do Firmicutes live in?
rice paddies
What is the only species of Firmicutes?
Heliobacterium
What type of bacteria are Firmicutes?
gram positive
Of the photosynthetic bacteria, which are oxygenic? anoxygenic?
oxygenic: Cyanobacteria
anoxygenic: Chloroflexi, Chlorobi, Firmicutes, Proteobacteria
Which bacteria phylum was the origin of chloroplasts?
cyanobacteria
Where in BC would you expect to find proteobacteria?
Mt Doug
Are proteobacteria green or purple?
purple
What are Firmicutes sometimes called? why?
Heliobacterium because they’re only one species
What are proteobacteria sometimes called?
purple bacteria
What light harvesting pigments do purple bacteria (proteobacteria), green bacteria, and heliobacterium have?
(Bchl) Bacteriochlorophyll
and
aliphatic, monocyclic carotenoids