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letra de photosynthesis rap - heath cottengim

[intro: heath cottengim]
i was walking down the street when i saw a plant
didn’t need a college degree to see that plant’s can’t
eat food, but how could this be?
don’t plants need glucose for energy?
heath, plants do photosynthesis
a glucose producin’, sunlight usin’, co2 reducin’…
whoa, whoa guys you’re going to fast
alright let’s break it down, starting with the chloroplast

[verse 1: heath cottengim]
the organelle with fat stacks of thylakoids
where molecules of water go to get destroyed
by that i mean they’re oxidized at photosystem ii
a protein complex that uses light, to excite, a few…
electrons to a high energy state
they’ll be powering the proton pumps that will generate
gradient across the thylakoid membrane
looks like we got ourselves another electron transport chain
only this time, protons have been pumped inside
if they want to diffuse out, they’re gonna have to slide through atp synthase, the only enzyme you know, that’s gonna make
atp whenever there’s proton flow
how many? well the calvin cycle uuuses
18 atp for each glucose it produces…i
have to warn you, things are about to get edgy
i’m about expose the secret life of veggie

[chorus: heath cottengim]
stealing light from the sun, that’s the motto
whether you’re a bean or tomato. grand theft auto…
trophs have got the growth phenomenon
built on that famous sugary hexagon
not to mention releasing oxygen gas
promoting evolution and greater biom-ss
so throw your hands in the air, cuz you know it wouldn’t be there if it wasn’t for this: photosynthesis

[verse 2: heath cottengim]
a lot has happened so far, but we’re not done
cuz our electron has arrived at photosystem i
all the energy from that initial photon
has been used up by this point and is now gone. one more round of photoexcitation is an indication that we’re back up
to a high energy elevation, so…
the plant, or algae, or whatever, wants to get theeeese
electrons out into the stoma, which in
caaaase you’ve been living in a coma, is where the calvin
cycle goes over and over
nadp+ is willing to gain
two electrons and an h in exchange for a name change to…
nadph, a stable coenzyme designed
to provide a hydride when it’s time. and when it
is, you’re gonna need 12 of those suckers
why so many? don’t look at me! i didn’t make the recipe
ha, just kidding, i’ll tell you the reason. but first
a thesis that i’ve been meaning to appease. among these
two molecules on our shopping list, atp
hits biggest with 18 needed to -ssist
that kind of demand demands a better plan than having
an electron span both photosystems man
therefore, electron takes a detour before it gets
absorbed by nadp+ and thus like a
television, it’s gonna rerun through the et
c and back to photosystem 1 when its done in con…
clusion, atp deficit? cyclic transport’s fixin’ it as long as the area’s well lit
now we have the energy we need, invested
chemically, so we can leave like a bird from the nest
cause up next, in the stroma, don’t be afraid. we’re gonna
see how the biological sausage is made

[chorus]

[verse 3: heath cottengim]
co2 gets bound to rubp to make a
6-carbon compound that’s about as stable as
mike tyson on ice skates, so it separates
into 2 molecules of 3-phosphoglycerate
don’t worry about rubp, it’s just a
structure pre-made to receive a co2 upgrade
what you need to know is that this combo won’t go
without an -ssist from a catalyst called rubisco
rubisco, this protein, has gotta be
the most important enzyme that you’ve ever seen
and you’ve definitely seen it, most abundant on the planet
making good use of its fixation talent
sliding carbons on the chain so smooth: crisco
put it on your bio highlight reel: gopro
“i don’t think it’ll be on the test.” you wish bro
forget this enzyme and i’ll throw you out the window
back to 3-phosphoglycerate, which we
abbreviate to 3pg, the strategy is
atp’ll donate a phosphate while nadph
reduces, which produces, breaking news it’s
g3p, the three “c” mvp. this compound leaves the chloroplast so fast p-ssed your retina, to make glucose, cellulose, starch, etcetera
if the calvin cycle ended here that would…
be pretty radical, but the actual
forces us to now get mathematical
if you ran the cycle three times, you might think you’d have
6 g3p ready to go, but no, only
one of those goes to make a sugar. the rest are gonna
linger, what you need to consider is the 3ru
bps that were found initially will be
absentee the next round, unless we rebound
let me help you get the sense of what’s about to go down
5 g3ps condense to-3-sequences-of
5, keeping alive, the carbon end of the
bargain, but we’re starving without the icing on the
cake: a phosphate, make it a triplet
don’t forget this is us paying the debt for-the-three
rubp we spent at the cycle’s onset
guys let’s try to summarize in under a minute
6 of calvin’s cycles sights the arrival of the
2 g3ps that are the keys to the puzzle to make
one glucose, which’ll cost us both a lot of
atp and nadph, specifically
18 and 12 respectively, effectively the calvin
cycle’s batteries. hope your next test or
project gets you good looks. i’m off to
write another chapter in the hip-hop textbook

[outro: heath cottengim]
woo, yeah, no excuses now
you better have not forgot about rubisco already
shout out to your mom, mother nature
don’t hate us cuz we’re making that glucose, son…light
powering the world’s number one reaction
giving autotrophs the means to keep moving on

- heath cottengim

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