Photosynthesis Flashcards
Light Absorption, Chemiosmosis, Calvin Cycle (27 cards)
What are the three major steps of photosynthesis?
Chlorophyll absorbs light, Light DEpendent and INdependent reactions
What light does chlorophyll absorb and reflect?
Absorb: red and blue | Reflect: green
What is the stroma?
The space between the inner and outer membrane of chloroplasts
Where are chloroplasts are located?
Mesophyll
What is the difference between a thylakoid and a granum?
A thylakoid is a membrane sac that has chlorophyll on its membrane that absorbs light. Granum is a stack of thylakoids.
What is the equation of photosynthesis?
6CO(2) + 6H(2)O + light energy > C(6)H(12)O(6) + 6O(2)
Carbon Dioxide + Water + Light > Glucose + Oxygen
How do plants produce oxygen?
They split carbon dioxide into separate molecules of C(2) and O
What is carbon reduced to in photosynthesis?
Glucose
What happens when pigments absorb photons?
Electrons become unstable (excited) from the energy, and diffuse across the thylakoid membrane. After, the electrons return to a stable state.
The absorption of a photon also starts the transport of electrons.
Where does the Electron Transport Chain occur?
Photosystem
What part of the Electron Transport Chain start and end?
Starts in PSII and ends in PSI
How do electron move to a lower energy level in the ETC? What is the lower energy level called?
- Electron carriers 2. PSI
What does NADP+ stand for?
Nicotinamide Adenine Dinucleotide Phosphate
How does the loss of electrons affect the chlorophyll? What are the effects?
The chlorophyll becomes unstable, and water molecules are broken into H+ and O(2)
(there’s no equilibrium in concentration)
Where is the Electron Transport Chain located?
Thylakoid Membrane
What causes phosphorylation of ADP to ATP by ATP Synthase?
When electrons move across ETC, concentration gradient of hydrogen ions form on thylakoid membrane. H+ has higher concentration inside thylakoid space, so they go to low concentration by going across the membrane into the stroma space.
Where is ATP produced?
In the stroma
What is ATP used for after production in chemiosmosis?
Light independent reaction of Calvin Cycle
What type of light reaction creates ATP and NADPH?
Light dependent reactions
What enzyme binds CO(2) to RUBP molecule in the Calvin Cycle?
Rubisco
What does RUBP stand for in the Calvin Cycle?
Ribulose Bisphosphate
What happens when CO(2) combines with RUBP?
6-carrbon chain is split into 2 molecules of 3PGA
How is 3PGA converted into G3P?
Each 3GPA gets a phosphate group from ATP, and a hydrogen ion from NADPH.
What can G3P be used for?
Regeneration of RuBP, glucose, or organic compounds
