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Energy And Motion In Cells > Purple Photosynthesis > Flashcards

Purple Photosynthesis Flashcards

0
Q

What part of chlorophyll makes it lipid soluble?

A

Phytol side chain

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1
Q

What is the principle photosynthetic pigment in higher plants?

A

Chlorophyll

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2
Q

What metal ion is present in chlorophyll and how is it coordinated?

A

A magnesium ion coordinated to the four pyrrole nitrogens.

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3
Q

Two light harvesting pigments? (not chlorophyl)

A

Carotenoids and bilins

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4
Q

What type of photosynthetic organism is the purple non-sulphur bacteria?

A

Anoxygenic photosynthetic bacteria. oxygen is not produced as a waste product.

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5
Q

Why do photosynthetic organisms have extensive membrane systems?

A

To pack in as much light harvesting pigments.

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6
Q

How many peptides are present in the reaction centre of purple photosynthetic bacteria?

A

3, light, medium and heavy (as on SDS page).

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7
Q

Describe the reaction centre of purple bacteria?

A

1) P870-dimer
2) BA and BB bacteriochlorophylls
3) HA and HB- bacteriopheophytins
4) QA and QB- ubiquinone with an iron molecule in-between

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8
Q

Which branch is used in transmembrane electron transfer in bacteria?

A

A chain

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9
Q

What molecule re reduces P870? in bacteria?

A

Cyt c2

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10
Q

What quinones are involved in proton translocation in bacteria?

A

Isoprenoids

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11
Q

What is the antenna system called in purple bacteria?

A

LH2, made up of two cylinders of Alpha and beta peptides.

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12
Q

What is the central core antenna complex called in purple bacteria?

A

LH1- larger as reaction centre is in the middle.

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13
Q

What complex is involved in water oxidation?

A

A cluster of 4 Manganese ions

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14
Q

Electrons are passed from the water to?

A

Tyrosine Z.

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15
Q

What is the net effect of light driven transmembrane electron transfer from water to plastoquinone?

A

One H+ for every e-

16
Q

In green photosynthetic reaction centre PS2 what are the two antenna proteins called?

A

CP43 and CP47

17
Q

The peripheral antenna (LH11) consists of six types of related integral membrane pigment proteins called?

A

Lhcb1-6

18
Q

What is the complex that oxidises plastoquinol and uses the elctrons to reduce plastocyanin?

A

Cytochrome bF

19
Q

Where is plastocyanin located in photosynthesis?

A

A small, water soluble protein located in the thylakoid lumen. Copper redox centre.

20
Q

What polypeptides bind cofactors to form the reaction centre of PS1?

A

PsaA, PsaB and PsaC

21
Q

Describe the reaction centre in PS1?

A

Plastocyanin reduces P700, passed along to chlorophyll molecules to A0(another chlorophyll A). Then to a tightly bound phylloquinone. passed to Fb iron sulphur centres via Fa and Fb. Fb to ferredoxin, then via FNR to NADP.

Energy And Motion In Cells (3 decks)

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