5.2.1 Photosynthesis Flashcards
1
Q
Structure of chlorophyll
A
- Contains Mg 2+ group
- Not a protein
2
Q
Structure of Chloroplast
A
- Double membraned
- Thylakoid discs stacked to form grana (singular granum) (site of LDS)
- Grana are joined together by lamellae (membranous channels)
- Complexes of pigments embedded in the thylakoids absorb light
- Fluid enclosed is called the stroma
3
Q
Where does the LDS occur?
A
Within and across the thylakoid membranes
4
Q
Where does the LIS (Light Independent stage) occur?
A
- Stroma
5
Q
What are the reactants and products in 1 turn of the Calvin cycle?
A
- 1 CO2
- 1 RuBP
- Unstable (6 - C) intermediate
- 2 GP (3 - C)
- 2 NADPH (ATP)
- 2 TP (3 - C)
6
Q
Calvin Cycle summary
A
- Carbon Fixation - rubisco enzyme catalyses the reaction between RuBP and CO2
- Reduction - GP is reduced by NADPH with ATP energy to TP
- Regeneration - RuBP is regenerated with the remaining TP
7
Q
What products from the LDS is needed for the Calvin Cycle to continue?
A
- NADPH (reduced NADP)
- ATP
8
Q
How are electrons transported across in the LDS?
A
- Electron transport chain
9
Q
What is the final electron acceptor in the LDS?
A
NADP+
10
Q
How is ATP produced in the LDS? (Chem osmosis steps)
A
- Energy from the movement of electrons through the transport chain is used to pump H+ ions into the Thylakoid space
- High concentration of H+ in the thylakoid space compared to stroma forming an ELECTROCHEMICAL GRADIENT
- H+ moves via facilitated diffusion through ATP synthase forming ATP (Chemiosmosis)