Bio 172 Questions Study Guide Graded A+

Which of the following statements is true? {Ans: Spontaneous reactions have a negative ΔG.}What occurs in the active site of an enzyme? {Ans: It is where the reactants bind to the enzyme. Non-covalent interactions occur. It is the site where reactants are converted into products.}It is often stated that the phosphate bonds in ATP are "high energy," but in fact, they are not notably high in energy. Rather, they are easy to break, and the ΔG of hydrolysis is a "useful" quantity of energy. What makes the phosphate bonds easy to break? {Ans: Negative charges on phosphate groups repel each other.}What type of interaction is responsible for the formation of secondary structure of proteins? {Ans: Hydrogen bonds between portions of the polypeptide backbone}What is the main characteristic that determines the ability of a protein to carry out its function? {Ans: The three-dimensional shape of the protein.}A peptide bond, established by the polymerization of amino acids is an example of {Ans: a polar covalent bond}