I have a question about my Chemistry Stack Exchange post: United Atoms Model book recommendation

The number of optically active compound(s) obtained upon complete ozonolysis of the following optically active compound is In the question, I broke all the double bonds and added a $\ce{-CHO}$ group according to the question (ozonolysis). Checking for the optically active compounds I...

There are so many biological processes which are dependent upon ions of lighter metals (upper part of periodic table) such as K+, Na+, Mg2+ and even early transition elements (Fe, Mn, Cu, Ni) but I haven't yet come across dependence of biological phenomena on aluminium. Is it because there is les...