photorespiration

Which of the following statements on photorespiration are correct? (multiple answers)

A. One possible explanation for the rubisco activity that starts the photorespiration pathway is that it represents an evolutionary “hang-over” activity, because when rubisco evolved the atmosphere did not contain much O2 yet so that this defect was not apparent.

B. In photorespiration, O2 is consumed but CO2 is neither consumed nor released.

C. The product of the rubisco reaction that contains the added oxygen is 3-phosphoglycerate.

D. Increased temperatures lead to a higher ratio of dissolved CO2 to O2 and therefore to less photorespiration.

E. Photorespiration occurs only in the dark when no light is available.