Photosynthesis Flashcards
1
Q
Chloroplast
A
- 3-10micrometers
- Double membrane
- 70s ribosomes
- Circular DNA
2
Q
A
3
Q
A
4
Q
How structure of a chloroplast is related to its function (describe, s19/43)
A
5
Q
A
6
Q
Role of chloroplast pigments in light absorption (describe, S20/42)
A
- pigments arranged in light-harvesting clusters
- forming photosystems
- accessory pigments surround primary pigment
- accessory pigment e.g. chlorophyll b/carotene/xanthophyll
- primary pigment is chlorophyll a
- reaction centre
- accessory pigments absorb light energy
- pass energy on to, chlorophyll a/primary pigment/reaction centre
- pigments absorb light at different wavelengths/maximizing light absorbed for
photosynthesis
7
Q
Light-dependent stage
A
- cyclic photophosphorylation
- non-cyclic photophosphorylatio
8
Q
A
9
Q
A
10
Q
Cyclic photophosphorylation (explain, syllabus)
A
- only photosystem I (PSI) is involved
- photoactivation of chlorophyll occurs
- ATP is synthesised
11
Q
Non-cyclic photophosphorylation (explain, syllabus)
A
- photosystem I (PSI) and photosystem II (PSII) are both involved
- photoactivation of chlorophyll occurs
- the oxygen-evolving complex catalyses the photolysis of water
- ATP and reduced NADP are synthesized
12
Q
Photophosphorylation (explain, syllabus)
A
- energetic electrons release energy as they pass through the electron transport chain
- the released energy is used to transfer protons across the thylakoid membrane
- protons return to the stroma from the thylakoid space by facilitated diffusion through ATP
synthase, providing energy for ATP synthesis
13
Q
Calvin cycle (outline, syllabus)
A
- rubisco catalyses the fixation of carbon dioxide by combination with a molecule of ribulose
biphosphate (RuBP), a 5C compound, forming a 6C unstable compound which then split to
yield two molecules of glycerate 3-phosphate (GP), a 3C compound - GP is reduced to triose phosphate (TP) in reactions involving reduced NADP and ATP from
light-dependent stage - RuBP is regenerated from TP in reactions that use ATP
Calvin
14
Q
A
15
Q
Calvin cycle intermediates:
A
used to produce other molecules
