Define ligand, receptor, and receptor site.

In biological processes, it is often observed that various molecules interact with a functioning protein. This interaction might occur in which of the following ways: A) at a transport site, B) through a protein portal /channel, C) at a binding site, D) at an active site, E) all of these are examples.

List the four characteristics of a protein-binding site?

Rank these steps:  The C-terminal fragment of the original peptide is released. A peptide side chain binds to the specificity pocket of chymotrypsin. The N-terminal fragment of the original peptide is released. Water binds to the active site of chymotrypsin.