#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
#Question id: 638
#Unit 1. Molecules and their Interaction Relevant to Biology
Match the following class of enzymes with them
|
Enzyme |
Class of enzyme |
|
A. Hexokinase |
1 |
|
B. Phosphoglucoisomerase |
2 |
|
C. Glyceraldehyde 3-phosphate dehydrogenase |
3 |
|
D. Phosphoglycerate mutase |
4 |
|
E. Enolase |
5 |
|
F. Aldolase |
#Question id: 639
#Unit 1. Molecules and their Interaction Relevant to Biology
Match the coenzymes in column I enzymes to class of enzymes in column II
|
A. Phosphofructokinase |
1. Redox reaction |
|
B. Enolase |
2. Phosphoryl shift |
|
C. Phosphoglycerate mutase |
3. Dehydration |
|
D. Glyceraldehyde 3 Phosphate dehydrogenase |
4. Phosphoryl transfer |
#Question id: 640
#Unit 1. Molecules and their Interaction Relevant to Biology
The data in the table above were collected for an enzyme-catalyzed reaction. The Km for this enzyme is approximately