1. Most cyanobacteria are photoautotrophs. Some other bacteriaare called photoheterotrophs. What do you think this means in termsof metabolic capability and production? Explain. Would you thinkphotoheterotrophs represent an ancestral group of photosyntheticorganisms or a more recent group that evolved after thephotoautotrophs?
2. Some plants with genetic defects are unable to photorespire.These plants end up being damaged under intense light. Researchesidentify this as evidence that photorespiration is a protectivemechanism in plants. Why might a disabling of the photorespiratorypathway lead to cell damage and how might the process ofphotorespiration mitigate this damage?
