How many atoms are in a mole of atoms

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

Can someone me with 3 and 4 plz. this is for masteries test.

Which suspect most likely committed the robbery and how do you know