The amino acid with a side-chain pK_a just below neutrality and which plays an important role as a proton donor and acceptor in many enzyme catalyzed reactions is:

Nucleic acid certain protein cell membranes certain carbohydrates

What controls activities within a eukaryotic cell?

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.