#Question id: 636
#Unit 1. Structure and Function of Biomolecules
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. Structure and Function of Biomolecules
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. Structure and Function of Biomolecules
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. Structure and Function of Biomolecules
Match the coenzymes in column I enzymes to class of enzymes in column II
| Enzyme | Reaction Type |
| 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. Structure and Function of Biomolecules
The data in the table above were collected for an enzyme-catalyzed reaction. The Km for this enzyme is approximately
#Question id: 641
#Unit 1. Structure and Function of Biomolecules
Which of the following does NOT describe a mechanism that cells use to regulate enzyme activities?
A. Cells control enzyme activity by phosphorylation and dephosphorylation.
B. Cells control enzyme activity by the binding of small molecules.
C. Cells control the rates of diffusion of substrates to enzymes.
D. Cells control the rates of enzyme degradation.
E. Cells control the rates of enzyme synthesis.
F. Cells control the targeting of enzymes to specific organelles.