Blood cells can be identified by their round appearance. Unlike plant cells, they do not have cell walls. At 40x, how many individual blood cells can be seen in the viewing field?

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?