zinc in its 2 oxidation state is an essential metal ion for life. zn2 is found bound to many proteins that are involved in biological processes, but unfortunately zn2 is hard to detect by common chemical methods. therefore, scientists who are interested in studying zn2 -containing proteins frequently substitute cd2 for zn2 , since cd2 is easier to detect. (a) on the basis of the properties of the elements and ions discussed in this chapter and their positions in the periodic table, describe the pros and cons of using cd2 as a zn2 substitute. (b) proteins that speed up (catalyze) chemical reactions are called enzymes. many enzymes are required for proper metabolic reactions in the body. one problem with using cd2 to replace zn2 in enzymes is that cd2 substitution can decrease or even eliminate enzymatic activity. can you suggest a different metal ion that might replace zn2 in enzymes instead of cd2 ? justify your answer.
