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
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 I, enzymes (NADPH reductase), ATP synthase
Light Reactions (first phase)
-produces ATP and NADPH
-Photosystems embedded in thylakoid membrane contain chlorophyll that absorbs light energy
-photosystem 2 (first one) water is split into oxygen.
-light energy produced high energy electrons
-Electrons shuttled by NADPH move throw photosynthetic transport chain which pumps H+ in thylakoid space
-H+ gradient powers ATP Synthase, making ATP
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 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 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 is NADPH formed in the photosynthetic electron transport chain?
At enzymes in the membrane that accept high energy electrons
What occurs at ATP synthase in the photosynthetic electron transport chain?
H+ move down their concentration gradient (energy-less) from thylakoid space to stroma, facilitating the formation of ATP from ADP + P.
What is produced in the photosynthetic electron transport chain?
6O2 as well as ATP and NADPH
What is the reactant that is used up in the photosynthetic electron transport chain?
6H2O
What products of the photosynthetic electron transport chain are used by the Calvin cycle?
NADPH and ATP
What photosynthesis reactant is reacted in the Calvin cycle?
6CO2
What is the other name for the Calvin Cycle?
Carbon fixation
Where does the Calvin cycle occur?
The stroma of a chloroplast
Where does the photosynthetic electron transport chain take place?
The thylakoid membrane
How many turns of the Calvin cycle are required to produce Glucose?
3
