Chapter 5 Flashcards
(18 cards)
What is a Light-Dependent Rxns
Light energy is captured by pigment molecules and is used to synthesize Nicotinamide Adenine Dinucleotide Phosphate (NADPH) and ATP
What is the Calvin Cycle
Second stage of photosynthesis that uses ATP and NADPH to covert CO2 into sugars called carbon fixation
What are the three membranes of the chloroplast
- Outer Membrane
- Inner Membrane
- Thylakoid Membrane
What can happen when an e- is excited
- Excited e- simply returns to its ground state, releasing energy (as thermal or fluorescence)
- Energy of the excited e- is transferred to an e- in a neighbouring pigment molecule, original excited e- returns to its ground state
- Excited e- may itself be transferred to a nearby e- accepting molecule
What is Photosystem I (PSI)
Contains chlorophyll a molecules that absorbs light at a wavelength of 700 nm
What is Photosystem II (PSII)
Contains chlorophyll a molecules that absorbs light at a wavelength of 680 nm ** PSII comes before PSI
What is a Photosystems
Photosystems is something that trap photons of light and use the energy to energize chlorophyll a in the rxn centre
What are the to light capturing complexes
PSI and PSII
What is the goal of Photosystem II (PSII) and what does it do
-GOAL → split H2O into electrons, protons and oxygen gas
-Absorbs 680 nm light (P680)
What is a Plastoquinone (PQ)
-Moves an e to the Cytochrome Complex
-Move Hydrogen atoms across the membrane as it transports an electron
What does the Cytochrome Complex do
Cytochrome Complex accepts e from PQ and transfers it to Plastocyanin
What does the Plastocyanin do
Plastocyanin transfers the e to Photosystem I (PSI)
What does Photosystem I do
Absorbs 700nm light (P700)
- Light energy is used to excite an electron the e is than accepted by an electron acceptor then the electron acceptor passes the e on to ferredoxin
What is Linear Electron Transport
When e move through both photosystem to form NADPH
What occurs in fixation
Converting carbon from an inorganic form to an organic form
What occurs in Reduction
Each molecule of 3-phosphoglycerate gets an additional phosphate from ATP which is then reduced by e- from NADPH, producing glyceraldehyde-3- phosphate (G3P)
What occurs in Regeneration
Five of the six G3P molecules are used to regenerate RuBP that is required to start the cycle over again
What is needed To make 1 G3P:
9 ATP are required
6 NADPH are required
