If a mouse and a small lizard of the same mass were placed in respirometer under identical environmental conditions, which animal would consume oxygen at a higher rate

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?