Photosynthesis Flashcards
Overview of Photosynthesis
6CO2 + 6H20 + Light–> 6O2 +C6H12O6
Where does CO2 enter the leaf and O2 exits via what?
Stomata
Where is H2O delivered to leaves in what?
Xylem vessels
Chloroplasts are abundant in what? Which gives them the green pigmentation?
- Mesophyll cells
- Chlorophyll
Chloroplast Structure
- Double membrane
- Stroma: dense interior fluid
- Thylakoids arranged instacks called grana
Where do the light reactions take place?
Thylakoid membrane
Where do the dark reactions take place?
Stroma (lamellae)
Does a photon of light with shorter wavelength carry more or less energy than a long wavelength? True or False
TRUE
Why are plants GREEN?
Reflected light is green
What are the several pigments in chloroplasts?
(3)
- Chlorophyll A
- Chlorophyll B
- Accessory pigments: Carotenoids (B-carotene and lutein)
What light works best for photosynthesis?
- Red light
- Blue/Violet light
Two Stages of Photosynthesis
- Light driven synthesis of ATP and NADPH-light energy converted into chemical energy
- Calvin Cycle-plant uses ATP and NADPH to synthesize carbohydrates
The excited electon can return to its ground state by emitting excess energy in what form? (4)
- Fluorescence
- Heat
- ATP
- NADPH
What is the reaction of splitting water with light energy?
H20–>O2 +2e-
Photolysis
Photosystem Complexes have 3 main components
- Light-harvesting complex: absorb light and transmit it to the photochemical reaction center
- Photochemical reaction center: Charge separation occurs
- Primary electron acceptor (STROMA)
What are the differences between Mitochondria and Chloroplasts?
(2)
- Matrix/Thylakoid space
2.Cristae /Thylakoid Membrane
What are the differences between Mitochondria and Chloroplasts?
(2)
- Matrix/Thylakoid space
- Critae/Thylakoid Membrane
How many molecules of CO2 does it take to synthesize 1 molecule of glyceraldehyde 3-phosphate?
Carbon-fixation Cycle
3, and it takes 9 ATP, 6 NADPH
Where does the Carbon-fixation reaction take place?
Begins in stroma-continues in the cytosol
Chemiosmosis
Movement of protonts from the thylakoid lumen to the stroma via ATP synthase drives the phosphorylation of ADP to make ATP
In PS2 where is water split?
oxygen-evolving center
What photosytem is p680+ in?
PSII
P700 is in what photosystem?
PS I
Low ph in lumen due to what?
H+ concentration
How many molecules of CO2, NADPH, and ATP are needed to form 1 molecule of Glyceraldehye 3-phosphate?
3 CO2, 6 NADPH, 9 ATP
