Peptides can be separated using an ion‑exchange column based on their isoelectric (pi) values. at which ph values would two different peptides, one with a pi of 5.5 and the other with a pi of 9.1 , bind to a cation‑ and anion‑exchange column? each peptide may be capable of binding to each column at more than one ph value.

explanation:

i think option no d is the correct answer

the correct answer would be d. hope this !

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

hope this :