LIR

Question 1

RuBisCO

Answer 1

Ribulose Bisphosphate Carboxylase Oxygenase
most abundant protein (basis of all life)
catalyses carboxylation of ribulose 1,5-bisphosphate

Question 2

CBB stages/ overall

Answer 2

fixation
reduction
regeneration

needs: 3ATP + 2NADPH
multiple cycles

Question 3

fixation

Answer 3

RuBisCO used in CO2 assimilation
RuBP + CO2 + H2O —> 2x 3-Phosphoglygerate
C5 + C1 —> 2x C3

Question 4

reduction

Answer 4

3-phosphoglycerate —–> 1,3-bisphosphoglycerate
(ATP —> ADP + Pi from LDR)
–RED.–> glyceraldehyde 3 phosphate
(NADPH –OX.–> NADP+ + e-)

Question 5

reduction

Answer 5

3-phosphoglycerate —–> 1,3-bisphosphoglycerate
(ATP —> ADP + Pi from LDR)
–RED.–> glyceraldehyde 3 phosphate
(NADPH –OX.–> NADP+ + e-)

Question 6

reduction

Answer 6

Happens twice

3-phosphoglycerate —–> 1,3-bisphosphoglycerate…..
(ATP —> ADP + Pi from LDR)
…..–RED.–> glyceraldehyde 3 phosphate
(NADPH –OX.–> NADP+ + e-)

Question 7

Regeneration

Answer 7

Happens twice
…of RuBP
ribulose 5-phosphate —–> ribulose 1,5-bisphosphate…..
(ATP —> ADP + Pi from LDR)

Question 8

photorespiration

Answer 8

RuBisCO fixes O2 into 2-phosphoglycolate
RuBisCO has low specificity for CO2
happens when its hot and dry

Question 9

photoinhibition

Answer 9

PS2 saturated with too much light E

XS E passed to O and creates free radical

Question 10

adaptations to sunny env.

Answer 10

more PS2
less LHC2
smaller leaves
less chlorophyll

Question 11

adaptations to shady env.

Answer 11

less PS2
more LHC2
larger leaves
more chlorophyll

Question 12

short term acclimation

Answer 12

XS E —> heat

xanthrophyll cycle

Question 13

medium term acclimation

Answer 13

inc. photosynthetic capacity

Question 14

long term acclimation

Answer 14

morphological change

Question 15

2-phosphoglycolate —–> 3-phosphoglycerate

Answer 15

loss in C
uses ATP
produces CO2 + NH3
takes place in perioxome and mitochondria