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Worksheetsbioc.3 Enzymes
Total questions: 9
Worksheet time: 5mins
Enzymes catalyze biochemical reactions by altering which of the following quantities associated with the reaction?
The enthalpy of formation ΔH
The equilibrium constant Keq
The change in Gibb’s free energy ΔG
The activation energy Ea
Phosphoglucomutase, which catalyses the formation of glucose-6-phosphate from glucose-1-phosphate, is best classified as which of the following enzyme type?
Oxidoreductase
Isomerase
Kinase
Lyase
Which of the following molecules cannot be classified as an enzymatic cofactor?
Valine
Flavin adenine dinucleotide (FAD)
Mg2+
Heme
In order to analyze the catalytic effect of two different enzymes on the same chemical reaction, it is best to compare which of the following quantities?
The difference between transition state energies
The differences in enthalpy between the reactants and products
The differences in free energy between the reactants and products
The differences in entropy between the reactants and products
The induced fit model of enzyme binding states that which of the following molecules alters the enzyme active site to more closely match the shape of the substrate?
A cofactor
The substrate
An allosteric effector
A coenzyme
The active site model (also called the lock and key model) of enzyme-substrate binding differs from the induced fit model in which of the following ways?
The induced fit model holds that the shape of the active site is altered during the course of substrate binding
The induced fit model holds that the shape of the substrate is irrelevant to enzyme-substrate binding
The induced fit model holds that the shape of the active site is permanently altered by substrate binding
The induced fit model holds that enzyme-substrate binding does not take place at the enzyme’s active site
Which of the following enzyme types catalyzes the formation of a single bond between two substrates through the elimination of H2O?
Ligase
Oxidoreductase
Isomerase
Hydrolase
Enzymes undergo a decrease in catalytic efficiency in the presence of excess temperature, but can regain this efficiency once temperature returns to normal: this suggests that increased temperature does not disrupt which of the following aspects of enzyme structure?
Peptide bonds
Van der Waal’s forces
Hydrophobic interactions
Hydrogen bonds
Local conditions can affect the specificity of an enzyme for its substrate, and thus the enzymes catalytic ability: which of the following alterations would most likely not affect an enzyme in this manner?
Increased temperature
Increased concentration of H+
Increased substrate concentration
Increased concentration of OH−
