Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
36 Cards in this Set
- Front
- Back
Where does photosythesis take place?
|
chloroplast
|
|
Where is drama Act I performed of photosynthesis?
|
thylakoid membrane inside each disk
|
|
What happens in the thylakoid membrane?
|
light energy is captured by electrons of chlorophyll molecules
|
|
What happens to the excited electrons?
|
they are passed along a series of acceptors in an electron transport chain
|
|
What do the protons do that were pumped out of the thylakoid membrane?
|
drive the production of ATP
|
|
What do excited electrons do?
|
they reduce NADP+ to NADH
|
|
What is the energy used for that is stored in NADH?
|
It is used in Act II for the biosythesis of glucose-- this takes place in the dark of the stroma-outside of the thylakoid membrane
|
|
With what is CO2 from the atmosphere combined?
|
a five carbon sugar
|
|
The light energy involved with photosynthesis drives the reduction of carbon essentially in what direction?
|
the reverse direction of oxidative carbohydrate metabolism
|
|
Where do light reactions take place?
|
thylakoid
|
|
Where do dark reactions take place?
|
stroma
|
|
Where do primary reactions of photosynthesis occur?
|
photosynthetic reaction center (PRC)
|
|
What do chlorophyll molecules in the reaction center do?
|
gather light- act as light harvesting antennas
|
|
What do the antenna chlorophylls do with the energy of the absorbed photons?
|
they pass the units of light from molecule to molecule until it reaches a PRC
|
|
What can sometimes happen with the energy of an absorbed photon?
|
it can be re-emitted in the form of fluorescence
|
|
Are there different types of chlorophyll?
|
yes
|
|
What type of ring do all chlorophylls have?
|
tetrapyrrole ring similar to that of porphryins of heme
|
|
Do chorophylls absorb different wavelengths of light?
|
yes
|
|
What are the accessory light absorbing pigments?
|
carotenoids
phycoerythrin phycocyanin |
|
What type of element does chlorophyl have in its center?
|
Mg
|
|
Does heme or chlorophyll have an extra ring?
|
chlorophyll
|
|
Do light-harvesting complexes contain multiple pigments?
|
yes
|
|
What are most of the light-harvesting complexes?
|
antenna pigments
|
|
What is the time for energy transer to the reaction center?
|
<10^-10
|
|
Accessory pigments
|
"fill in" regions of the absorption not covered by chlorophylls
|
|
In deeper water (10 m), light outside of wavelengths 450-550 nm is completely absorbed so what do algae and cyanobacteria replace chlorophyll a with?
|
phycoerythrin and phycocyanin
|
|
How many processes are part of photosynthesis?
|
two
|
|
What do the light reactions consist of?
|
electron transfer, where water is oxidized to produce oxygen and NADP+ is reduced to produce NADPH
|
|
What do the light reactions consist of?
|
electron transfer where carbon dioxide is reduced to carbohydrates
|
|
How many parts can we consider electrons in the light reaction to have?
|
three
|
|
What is the first part of the trip the electron takes?
|
transfer electrons from water to the reaction-center chlorophyllof PSII
|
|
What is the second part of the trip the electron takes?
|
the transfer of the electrons from the excited state chlorophyll of PSII to an electron-transport chain consisting of accessory pigments and cytochromes, with energy provided by absorption of a photon of light
|
|
What is the third part of the trip the electron takes?
|
moving of electrons from the excited-state chlorophyll of PSI to the ultimate electron acceptor NADP+, producing NADPH (again using energy provided by light)
|
|
The absorption of one photon does what?
|
promotes electron from ground state to excited state
|
|
What does the energy difference have to match?
|
energy difference between two states has to match the energy of the photon
|
|
Excitation transfer
|
resonance energy transfer
|