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1. Hydrogen Bonds. The chemical structure of Coenzyme-A, one of the most important metabolites in cellular biosynthesis, is shown below. Its own chemical synthesis and its reactivity more or less have something to do with the ability of the atoms on the molecule to form the numerous H bonds with other molecules. a) Identify: 1) atoms that can serve as a H bond proton acceptor. 2) hydrogen atoms that can serve as a H bond proton donor. Use an arrow to indicate the acceptor/donor (as shown in the examples) H -H H bond proton donor :X H bond proton acceptor H H3C CH3 WH H H 0 0 0 b) Some thermal stable enzymes are functional in water at up to 75 °C (363K). Are hydrogen bonds stable at that temperature? Explain your answer quantitatively.