Bio Module 8 Review Flashcards
What is the overall chemical reaction of photosynthesis. How does this reaction
compare to the overall reaction of cellular respiration?
- chloroplasts helps to convert solar energy into chemical energy inside chloroplasts
- CO2 enters andO2 exist leaf through pores called stomata
What are the 2 linked phases of photosynthesis, and what are the products of each?
1) conversion of light energy to chemical energy products: glucose , oxygen
2) Calvin cycle products: 3 ADP, 2 glyceraldehyde-3-phosphate (G3P) molecules, and 2 NADP+.
Describe chloroplast structure
Double membrane
* Fluid called stroma
* Thylakoids: sacs within the stroma
* Chlorophyll: pigment within thylakoid membrane
Which region of the light spectrum powers photosynthesis?
- light carries electromagnetic energy by waves
- only visible light is use for photosynthesis
- photons
In which specific organelle of the cell does photosynthesis occur in plants? What are the
structures found within this organelle, and where are the photosynthetic pigments
located?
Organelle: chloroplasts
- pigments absorb visible light and are in the thylakoid membrane
What is the function of pigments in the chloroplast?
There are 2 major types of pigments in plants
a. Chlorophyll a, b (Chl)
b. Carotenoids
- light absorbing head, hydrophobic tail inserts to thylakoid membrane
What wavelengths (colors) are absorbed by chlorophylls and carotenoids? Which colors
are most effective for photosynthesis?
clorophylls: absorb blue and red 9efficient for green plants
carotenoids: abrosb blue and some green
What are the components of a photosystem?
Reaction-center complex near light-harvesting complex
- is an association of proteins holding a
special pair of chlorophyll a molecules
and a primary electron acceptor
- Light-harvesting complexes (pigment
molecules bound to proteins)
What is the series of events that occurs following the absorption of a photon by the
light-harvesting complexes of a photosystem? What eventually becomes oxidized and
what becomes reduced? (think water, oxygen, pigments)
??/
Why is Photosystem II called “II” instead of “I”, since it functions first? What are its 2
major products?
Photosystem I was discovered first
PSII:
- reaction center P680
- absorbs wavelength at 680 nm
PSI:
Reaction center p700
Linear electron flow: produces ATP and NADPH using light energy
How are the electrons that are lost form P680 replaced?
Electrons lose 2 electrons and become P680+ These electrons are replaced from H20 which is oxidized to me O2 + H
P680+ is a oxidizing agent
How is oxygen produced by Photosystem II?
How is a proton gradient established? How is the proton gradient
converted to ATP in chloroplasts?
