This practical should have reinforced your understanding of torsion angles and their relationship to secondary structure. Secondly you should now understand the power of using structure to analyze how mutations can affect protein function.
Of course there are many other factors that mean a mutation can affect function as well as it being close to (or within) the active/binding site. For example, a mutation distant from the active site may destabilize the protein fold.
Using the answers that you recorded during the tutorial, now answer the following questions. This is only for your own benefit to ensure you have done all the stages correctly and understand what you are doing. These answers are not recorded.