The cost of NOT performing 2 cycles of photorespiration is
1 C in the form of CO2
4 C in the form of 2 molecules of phosphoglycolate
1 C (as CO2), 2 ATP, 2 NADPH equivalents, and one molecule ofNH4+
3 ATP and 2 NADPH
5 ATP and 2 NADPH
As temperature increases, the quantum yield of photosynthesis inC3 plants is directly affected by
The decreasing ratio of CO2 to O2 in the aqueous phase
The increasing ratio of CO2 to O2 in the aqueous phase
The decreasing ratio of CO2 to O2 in the gas phase
The increasing ratio of CO2 to O2 in the gas phase
In CAM plants and ‘regular’ C4 plants, the enzyme that firstfixes CO2 into an organic molecule is
Ribulose 1,5-bisphosphate carboxylase/oxygenase for both
Phosphoenolpyruvate carboxylase (PEPC) for both
NADP-malic enzyme for both
Rubisco in CAM, PEPC in ‘regular’ C4
Rubisco in ‘regular’ C4, PEPC in CAM
In CAM (crassulacean acid metabolism) plants, when and where
are sugars produced?
During the night, in mesophyll cells
During the day, in mesophyll cells
During the night, in bundle sheath cells
During the day, in bundle sheath cells
QUESTION 10
In ‘regular’ C4 plants, when and where are sugars
produced?
During the night, in mesophyll cells
During the day, in mesophyll cells
During the night, in bundle sheath cells
During the day, in bundle sheath cells
