Photosynthesis Flashcards

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1
Q

Chlorophyll a

A

A primary pigment light energy excites electrons from magnesium
Exists as PSII 680 PSI 700

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2
Q

Photosynthetic pigments

A

Accessory pigments absorb wide range of light pass energy on

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3
Q

Thylakoids

A

Discs that contain photosynthetic pigments - v large SA

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4
Q

Light dependent stage

A

Photolysis splits water into hydrogen ions and electrons
Light hits pII and excites pair of e-
E- passed along cytochromes this releases energy which pumps h+ ions in
Light hits PI and exited 2e-
These join with NADP to for NADPred
H+ ions pump through ATP synthase
Forms atp

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5
Q

ATP synthase

A

EMF which converts kinetic energy into chemical energy

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6
Q

Light independent stage

A

Takes place in the stroma
6 full turns produce glucose

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7
Q

RuBP to 2 GP

A

RubisCo + CO2 carboxylation
GP forms amino acids and fatty acids

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8
Q

2GP to 2TP

A

2 NADPred -> 2 NADP
Uses 2 ATP
TP forms glycerol and hexose sugars
Reduction

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9
Q

2TP to RuBP

A

Regeneration
Uses ATP

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10
Q

Light intensity effects on Calvin cycle (low light)

A

Less light energy
Less ATP and NADPred formed
GP cannot convert to TP
TP cannot convert to RuBP
RuBP convert to GP CO2 levels = same

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11
Q

Limiatations of using photosynthometer

A

Take into account effect of respiration
Some O2 may dissolve into the water
Lamp= heat
Dark only 1 light source
Not acclimatised

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12
Q

Cyclic light dependent stage

A

Occurs at same time
Only produces ATP and uses only PSI
No O2 or NADPred

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