Biology: Photosynthesis

Photosynthesis

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What do chloroplasts contain?
Photosynthetic pigments, photo-systems 1 and 2, carbohydrates stored as starch.
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What do the photo-systems best absorb light at?
PS1 at 700nm, PS2 at 680nm
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Name three limiting factors of photosynthesis:
Light intensity, CO2 concentration, temperature
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Why is cyclic LDR called cyclic?
As electrons are not passed to NADP but are instead passed back to PS1. This means not as much ATP is produced.
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Describe non-cyclic LDR (1):
Light energy is absorbed by PS2, this excited e- so they move to a higher energy level. Then the e- move along the ETC and are replaced as they do so. This creates energy that splits water into 2H+ and 1/2 O2.
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Describe non-cyclic LDR (2):
As electrons lose their energy down the ECT, it is used to transport H+ into the thylakoid. The H+ then moves down a concentration gradient via ATP synthase to form ATP. Light energy is then absorbed by PS1 to move electrons higher to reduce NADP.
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LIR: Describe the Calvin cycle (1):
CO2 enters the stomata. It then, in the stroma, combines with RuBP to form an unstable 6-C compound. This reduces into 2x 3-C GP. Rubisco catalyses this
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LIR: Describe the Calvin cycle (2):
ATP from LDR turns GP into TP by using the H+ from NADPH. TP is then used to form glucose.
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How many turns of the Calvin cycle are required to produce 1 molecule of glucose?
6 turns.
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What regenerates the Calvin cycle?
5/6 TP are used to regenerate RuBP rather than to form a glucose molecule
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Other cards in this set

Card 2

Front

What do the photo-systems best absorb light at?

Back

PS1 at 700nm, PS2 at 680nm

Card 3

Front

Name three limiting factors of photosynthesis:

Back

Preview of the front of card 3

Card 4

Front

Why is cyclic LDR called cyclic?

Back

Preview of the front of card 4

Card 5

Front

Describe non-cyclic LDR (1):

Back

Preview of the front of card 5
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