General Biochemistry, BCH 3053 – Spring 202 0 Form A EXAM #1: February 28, 2020 Name: U#: 31. The three energy diagrams shown below display the free energy changes associated with the conversion of S (substrate) to P (product), when the reaction is not catalyzed (A), when the reaction is catalyzed by enzyme X (B) and when the reaction is catalyzed by enzyme Y (C). Which of the following statements is correct? a) conversion of S to P is an endergonic process b) reaction B is faster than reaction C c) reaction C is faster than either of reactions A and B d) reaction A proceeds at the same rate as reaction C e) none of the above is correct 32. All of the following are weak non-covalent interactions except: a) hydrogen bonds b) peptide bonds c) dipole-dipole interactions d) salt bridges e) ion-dipole interactions 33. The rate of an enzyme catalyzed reaction is 33 mM/sec, when [S] = 3.1 mM. If the KM for this reaction is 2.2 mM, what is the rate when [S] = 2.2 mM? a) 56.4 mM/sec b) 28.2 mM/sec c) 33.0 mM/sec d) 64.0 mM/sec e) cannot be determined without knowing kcat