Question

Protein structures are displayed in several ways, including: spacefilling models, ball and stick models, stick models, backbone models (which show the n-calpha-c=o units) and the cartoon representation (which shows the secondary structures).

Choose the best representations for each and EXPLAIN why:

1) Channels, holes, or pockets in a protein.

2) Secondary structures present in a molecule.

3) Residues in the active site of an enzyme.

EXPLAIN your choice for each.