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Quiz Chapter 6
Cell Biology
| Question | Answer |
|---|---|
| Which of the following properties is not characteristic of enzymes? | Alter the equibrium distribution of substrate and product. |
| Allosteric effectors: | induce a conformational change in the protein to alter its activity. |
| Which of the following statements is true of zymogens? | they must be proteolytically cleaved to become activated |
| The induced-fit model: | states that the binding of the substrate causes a conformational change in the enzyme |
| The Michaelis constant Km refers to the ________ at which a reaction proceeds at ________ of the maximum velocity. | substrate concentration; 1/2 |
| In a chemical reaction, if ΔG is negative, it means that | the reaction will proceed spontaneously |
| How is a biochemical pathway regulated? | The end product inhibits the first enzyme of the pathway that is specific to the pathway by binding tan allosteric site |
| A certain enzyme will hydrolyze egg white but not starch. Which statement best explains this observation? | Enzyme molecules bind only to substrates which fit into the enzyme's active site. |
| Enzyme regulation may occur by several methods. Which of the following is NOT a means of enzyme regulation? | saturation |
| Phosphorylation is a common means of regulating protein activity. Which of the following amino acids are typically phosphorylated in proteins regulated by kinases? | Serine tyrosine threonine |
| In negative feedback mechanisms, when excess metabolic end products fill allosteric enzyme sites _______________ | the metabolic reaction is halted |
| All of the following are examples of ribozymes or ribozyme activity EXCEPT | zymogen |
| Which of the following is not a reversible way to modify enzyme activity? | Proteolytic cleavage |
| A linear relationship between Vmax and enzyme concentration would be expected when | [S]>>Km |
| Measurement of which of the following kinetic parameters requires that absolute concentration of the enzyme is known? | Kcat |
| The phosphorylation of glucose to generate glucose-6-phosphate is catalyzed by the enzyme hexokinase. This enzyme, however, is inhibited by its own product, glucose-6-phosphate. This is an example of: | substrate-level regulation |
| In noncompetitive inhibition, the allosteric inhibitor | attaches to the enzyme at a site away from the active site, altering the shape of the enzyme. |
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mjs021
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