Look at a metric ruler to see how small 1 mm is. Now imagine a distance one-hundredth as long, or 0.01 mm. Why can't you see your body's cell without the aid of a microscope? (This not a question for school, I do not support non-school related questions nor do I support advertising for other websites.)

You are studying a protein that you call protein x. there is an aspartic acid at a key position in protein x which is important in the folding and stabilization of that protein. if this aspartic acid is changed to a different amino acid, which type of amino acid substitutions is most likely to allow the protein to fold normally?