Quiz 6 Flashcards
What is the reaction of Photosynthesis?
6H2O + 6CO2 —-> C6H12O6 + 6O2
What are the two major steps in Photosynthesis?
- Light Dependent Rxns
- Light Independent Rxns
Define Light Dependent Rxns
energy from light is captured and used to create ATP and NADPH
Define Light Independent Rxns
ATP + NADPH + CO2 to make sugar
Who does Photosynthesis?
Plants, Algae, Photosynthetic Bacteria, and Cyanobacteria (blue green algae)
What is light?
ELectromagnetic energy traveling in packets of energy (Photos) that move in waves - wavelengths 400nm->740nm.
What does wavelength equal?
1/frequency
For a Photo of Light to serve as an energy source, it must what?
It must strike an electron in a Photosynthesis pigment molecule.
The electron is reflected if?
The frequency of the Photon does not equal the frequency of the electron.
The electron is absorbed if?
The frequency of the Photon = the frequency of the electron. This generates a high-energy excited electron.
What are some Photosynthetic Pigments?
- Bacteria Chlorophyll
- Chlorophyll A, Chlorophyll B, C, D
- Carotenoids - Carotine
What is Absorption Spectrum?
Wavelengths of light that are used by a specific pigment.
What is the Action Spectrum?
A curve depicting the amount of different wavelengths of light absorbed by a particular substance, a-pigment (rate of photosynthesis)
Where is the Light Dependent Rxn (LDR)?
On the Thylakoid membrane or on the membrane of Prokaryotes.
What do the thylakoid and prokaryote membranes contain?
Photosystems
What are photosystems?
Clusters of photosynthetic pigments imbedded in a T.M.P.
What does the Antenna Complex do?
It captures light energy and transfers it to Rxn Center Chlorophyll. It is composed of different photosynthetic pigments.
What does the Rxn Center Chlorophyll do?
Generate excited electrons.
What are the 3 known photosystems?
- P870 (Photosynthetic Bacteria)
- P680 (Eukaryotes and Cyanobacteria)
- P700 (Eukaryotes and Cyanobacteria)
What are the two versions of LDR?
- Cyclic Photophosphorylation
- Non-Cyclic Photophosphorylation
Who undergoes Cyclic Photophosphorylation?
Photosynthetic Bacteria
What is the process of Cyclic Photophosphorylation?
- Light strikes the antenna complex of P870
- Energy is absorbed and transferred to RCC, generating a high-energy excited electron.
- ETC takes the electron to a low energy state on P870.
- Energy pumps H+ across the membrane, generating a Proton Motive Force.
Who undergoes the Non-cyclic Photophosphorylation?
Eukaryotic, Cyanobacteria (blue green Algae)
What is the process of Non-cyclic Photophosphorylation?
- Light strikes A.C. in P680
- Energy transfers to RCC
- RCC produces 2 excited e-, going to E.T.C.
- ETC transports e- to low energy state on P700
- Energy used to split H2O.
