#Question id: 631
#Unit 1. Molecules and their Interaction Relevant to Biology
Two curves showing the rate versus substrate concentration are shown below for an enzyme-catalyzed reaction. One curve is for the reaction in the presence of substance X. The other curve is for data in the absence of substance X. Examine the curves and tell which statement below is false.
#Question id: 633
#Unit 1. Molecules and their Interaction Relevant to Biology
An amino acid transporter protein is responsible for the transport of a specific amino acid across a membrane. The KI values of several competitive inhibitors of the amino acid transporter are shown above. Based on these data, which of the following is most likely the amino acid transported by this protein?
#Question id: 634
#Unit 1. Molecules and their Interaction Relevant to Biology
An enzyme has a Vmax of 50 micromol product formed (minute x mg protein)-1 and a Km of 10 microM for the substrate. When a reaction mixture contains the enzyme and 5 microM substrate, which of the following percentages of the maximum velocity will be closest to the initial reaction rate?
#Question id: 635
#Unit 1. Molecules and their Interaction Relevant to Biology
The enymatic rate constant (kcat/Km) of orotidine 5ʹ-phosphate decarboxylase is 6 x 107 M-1s-1 and the nonenzymatic rate constant (kn) is 3 x 10-16 s-1. What is the value of the enzymeʹs catalytic proficiency?
#Question id: 636
#Unit 1. Molecules and their Interaction Relevant to Biology
DNA polymerase contains a lysine residue that is important for binding to DNA. Mutations were found that converted this lysine to either glutamate, glycine, valine, or arginine. Which mutations would be predicted to be the most and least harmful to the ability of the enzyme to bind DNA?
|
Most |
Least |
|
|
(A) |
Valine |
Aspartate |
|
(B) |
Glycine |
Arginine |
|
(C) |
Arginine |
Glycine |
|
(D) |
Glutamate |
Arginine |
#Question id: 637
#Unit 1. Molecules and their Interaction Relevant to Biology
Effect of temperature on enzymatic catalysis is analysed by the rate v of a chemical reaction varies with temperature according to the Arrhenius Equation which explains the sensitivity of enzyme reactions to temperature. A plot to determination of the activation energy Ea involves