Photosynthesis Flashcards
Discrete particle of packet of energy
Photons
Wavelength range of visible light
400 nm to 700 nm
What happens when a photon is absorbed
energy is transferred to an electron and it moves to a higher level energy state
what molecules are efficient in absorbing photons of specific wavelengths
pigments
what do all pigments have in common
a conjugating system of double/single carbon bonds
what does a blye 450 nm wavelength do to an electron
raise 2 levels
what does a red 700 nm wavlength do to an electron
raise 1 level
Photoautotrophic organism are known as what in the food chain
primary producers
What domains are able to use photosynthesis
Eukarya and Bacteria
Are halobacteria photosynthetic
No
What is photosynthesis
use of light energy to convernt carbondioxide into organic compounds
What is the chemical reaction of photosynthesis
6CO2 + 12H20 -> C6H12O6 + 6O2 +6H20
where are the enzymes of the Calvin Cycle in cyanobacteria
Cytosol
the process where an excited electron from a pigment molecule returns to its ground state, releasing energy or an emission of light
fluorescence
where are photosynthetic pigments embedded
thylakoid membranes
Main pigment in most photoautotrophs
chlorophylls
Accessory pigments
carotenoids
X chain in chlorophyll A
CH3 methyl group
X chain in chlorophyll B
CHO aldehyde group
A plot of how much light is intercepted (absorb) by the pigment
absorption spectrum
why do pigments absorb different wavelengths of light
the energy of the photon has to math the energy required to excite the electron or else nothing happens
how can you measure the rate of photosynthesis
through rate of consumption of CO2 and production of O2
plot of effectiveness of lightat each wavelength during photosynthesis
action spectrum
who produced the earliest action spectra
Theodor Engelmann
What has more energy? a photon of green light or a photon of red light
green light
What greater wavlengths? a photon of green light or a photon of red light
red light
what are the 3 fates of an excited-state electron
energy is released as heat or light (fluorescence), energy is transferred to a pigment molecule and it returns to normal state, the electron is transferred to an electron-accepting molecule
Difference between action spectrum and absorption spectrum
absorption is how much light is absorbed by the pigment while action spectrum is the effectiveness of light of a specific wavelength to drive a prodess
what is the transfer of energy from one electron to another
inductive resonance
what molecule shuttles electrons from photosystem II to the cytochrome complex
plastoquinone
what special chlorophyll molecyle is in photosystem II
P680
what special chlorophyll molecyle is in photosystem I
P700
What transfers protons to the thylakoid lumen to create a proyon motive force
plastoquinone
where are the proteins for photosynthesis imbedded
thylakoid membrane
What process gets a chlorophyll molecule into a state at which it is ready to give up an electron?
Absorpotion of photons of light
The use of light to generate ATP
photophosphorylation
flow of electron from photosystem II to photosystem I
linear electron transport
what form of transport occyrs only with photosystem I to continuously increase thr PMF in the thylakoid lumen
cyclic electron transport
is the calvin cycle exergonic or endergonic?
endergonic
