7) The allele N codes for a normal nose and the allele n codes for a green nose. If two individuals who are both heterozygous at this gene location mate with each other, what combinations of alleles will their
offspring have (genotypic ratio)? What will their noses look like (phenotypic ratio)?

The answer to your question is: ° All proteins contain carbon, hydrogen, oxygen and nitrogen.

Explanation:

Geradus Johnannes Mulder was a Dutch scientist that described the composition of proteins, specially albumin.

Also he mentioned that the proteins that he studied have the same empirical formula.

So, he focused his research on proteins, so the right answer to your question is :

   ° All proteins contain carbon,hydrogen,oxygen,and nitrogen.