Photosynthesis Flashcards
What is photosynthesis
A chemical process which green plants and other phototropes synthesize organic materials from CO2 and H20 in presence of sunlight
Explain the PS II part of light reaction
- Light energy eject e from Ps2
- Energy hops from one pigment to another until reaching the reaction center
- It then boosts an e from one of the reaction center to primary e acceptor which captures it.
- Ps2 then pulls replacement e from H2O breaking it.
5.O2 leaves the cell - H+ will increse gradient for ATP synthesis
Explain the Process of ETC 2
e enters ETC 2 in the thylakoid membrane
energy loss of e causes H to be pumped in the thylakoid membrane
Explain the process of PS1 and ETc 1
Light energy ejects e from PS1. Replacement e comes from ETC 1
e moves through ETC 1 then combine with NADP H+ forming NADPH (energy carrier molecule) H ions in the thylakoid compartment are propelled through
the interior of ATP synthases. It cause ADP to attach with P to form ATP molecules.
What happens in the fixation stage of Calvin Cycle
It begins with CO2 reacting with Rubilose Biphosphate(RuBP).
It fixes C and forms 3-phosphoglycerate.
It uses Rubisco enzymes
What happens in the reduction phase
3-phosphogycerate is phosphorylated by ATP, then reduced by e from NADPH
The product is glyceraldehyde-3-phosphate(G3P).
Some of it is used to produce glucose and fructose.
What happens in the Regeneration Phase
5 of G3P is used to make RuBP, 1 will exit the cycle.
G3P is used to make sucrose and starch( storage ) with cellulose (for cell wall)
What happens when photorespiration occurs( happens when O2 reacts with RuBP by rubisco.
Prevent synthesis of sugar
Plant may die due to unable to get enough energy for metabolic rate
How does C4 plants survive in hot climates.
Capture C and synthesize sugar in different cells.
Mesophyll cells of C4 plants fix C using an enzyme called
PEP carboxylase
