3.5.1: Photosynthesis Flashcards

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1
Q

What are the two stages of photosynthesis?

A

-Light dependent reaction
- Light independent reaction

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2
Q

Describe the LDR

A

1) Photoionisation. Chlorophyll absorbs light energy. Excites electrons. Chlorophyll is oxidised.

2) Electrons moves down electron transport chain releasing energy. Energy released to forms proton electrochemical gradient.

3) Photophosphorylation. H+ ions disuse through ATP synthase providing energy to join ADP and Pi to form ATP

4) Photolysis. H2O -> 2e- + 2H+ + 1/2O2. NADP reduced by hydrogens. Electrons replaces those lost

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3
Q

Where does the LDR occur?

A

Thylakoid membrane

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4
Q

Where does the LIR occur?

A

stroma

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5
Q

Why is LIR temperature sensitive?

A

Contains enzymes

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5
Q

Describe LIR

A

1) Fixation - RuBP combines with CO2 using the enzyme rubisco to form two GP.

2) Reduction - GP is reduced to TP using H from NADPH and energy from ATP. Some TP converted into useful organic products e.g. carbohydrates, amino acids and triglycerides

3) Regeneration - Most TP is regenerated back to RuBP using energy from ATP

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