When will photorespiration usually occur in plants?
A) when oxygen levels inside the leaf are low
B) when the plant is undergoing transpiration
C) during the Calvin cycle
D) when the stomates are closed

Protein and polypeptide sequences can be determined by first partially hydrolyzing the protein or polypeptide followed by amino acid sequencing of the fragment pieces using the chemical degradation process known as edman degradation. determine the sequence of the initial (18-amino acid) polypeptide that produces the following five partial sequences after hydrolysis and edman degradation.