There is one position in the signature sequence that can be occupied by any amino acid, although one amino acid appears much more often than any other. What is this variable position

Two things that biomedical has invented or innvated

If i make a solution by adding 83grams of sodium hydroxide to 750ml i’d water what is the molarity of sodium hydroxide

What are the charges of the subatomic particles by choosing the answer from the drop down menu. protons have a (+1,0,or-1). (protons,neutrons,electrons) have a 0 charge. 3.) electrons have a (+1,0,-1)