lecture 9 - photosynthesis Flashcards
Where does photosynthesis occur in a plant cell?
Chloroplast
What is the equation for photosynthesis?
6CO2 + 6H2O -> (plant,light) C6H12O6 + 6O2
What are the reactants in photosynthesis?
6 Carbon dioxide, 6 water
What are the products of photosynthesis?
1 glucose, 6 oxygen
How many membranes do chloroplasts have?
3
What are the three membranes of a chloroplast?
Outer, inner, thylakoid
What are the three compartments of a chloroplast?
Inter membrane space, stroma, thylakoid space.
Where are chlorophyll/other pigments contained in a chloroplast?
In the thylakoid
What is a key structural feature of the thylakoid?
It contains a highly folded thylakoid membrane
What is the goal of the light reaction?
To capture light energy and convert it to chemical energy. (ATP)
What are the key components in the membrane involved in the photosynthetic electron transport chain?
Photosystem II, cytochrome complex, Photosystem II, enzymes (NADPH reductase), ATP synthase
Where do the electrons in the photosynthetic electron transport chain come from?
The splitting of water molecules, which produces oxygen, H+ ions and electrons
What is the equation for the splitting of water in the photosynthetic electron transport chain?
H2O is converted to 1/2O2 and 2H+ and 2e-
What occurs at Photosystem II in the photosynthetic electron transport chain?
A pigment (chlorophyll) absorbs light energy, releasing high energy electrons which chemical energy.
How many electrons enter/exit photosystems in the photosynthetic electron transport chain?
2
What occurs at the cytochrome complex?
High energy electrons lose energy by transferring it to allow H+ to move against its concentration gradient, across the thylakoid membrane into the thylakoid space.
What occurs at Photosystem I in the photosynthetic electron transport chain?
Electrons that have lost energy at the cytochrome complex are re-energised by light energy, via chlorophyll pigment absorption.
Where do high energy electrons go to after they leave Photosystem I in photosynthetic electron transport chain?
To enzymes in the cell membrane that add them to carrying molecules - NADP+ - forming NADPH