Structure-Function You discovered a protein that binds to Ca2+ in its active site. You know the composition of the protein. Which amino acids possess an Rgroup you would expect to interact with the Ca2+?

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

No. an alpha particle is a pair of protons and a pair of neutrons, i.e. a helium