9. In pre-historic earth, where there exist no protein enzyme, ribozymes (ribose enzymes) seems to play their roles as catalysts. Rationale why they can be catalysts, while their precedent molecule DNA cannot be catalysts.
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- Which of the following statements about the allosteric site is true? a. The allosteric site is a second active site on a substrate in a metabolic pathway. b. The allosteric site on an enzyme can allow the product of a metabolic pathway to inhibit that enzyme and stop the pathway. c. When the allosteric site of an enzyme is occupied, the reaction is irreversible and the enzyme cannot react again. d. An allosteric activator prevents binding at the active site. e. An enzyme that possesses allosteric sites does not possess an active site.1. Write the reversible reactions with its corresponding enzymes of Dehydration viaHydrolysis reaction. a.) A tripeptide between lysine, alanine and arginine3. Most antibiotic cream contains sulfonamides or methotrexate. As a resident scientist in a pharmaceutical company, suggest which of the two is a better candidate as antibiotics from a biochemical/pathways/enzyme/safety point of view.
- 1. Why does a cell use deoxyribonuclease?In the following graph: A represents the product. B represents the energy of activation when enzymes are present. C is the free energy difference between A and D. C is the energy of activation without enzymes. E is the difference in free energy between the reactant and the products.In an enzymatic reaction: a. the enzyme leaves the reaction chemically unchanged. b. if the enzyme molecules approach maximal rate, and the substrate is continually increased, the rate of the reaction does not reach saturation. c. in the stomach, enzymes would have an optimal activity at a neutral pH. d. increasing temperature above the optimal value slows the reaction rate. e. the least important level of organization for an enzyme is its tertiary structure.
- Which of the following statements about inhibition is true? a. Allosteric inhibitors and allosteric activators are competitive for a given enzyme. b. If an inhibitor binds the active site, it is considered noncompetitive. c. If an inhibitor binds to a site other than the active site, this competitive inhibition. d. A noncompetitive inhibitor is believed to change the shape of the enzyme, making its active site inoperable. e. Competitive inhibition is usually not reversible.1.One of the main sources of sphingosine in the body is in the cell membrane. What complication could arise from the biological synthesis of ceramide?1. Explain why sucrose is non reducing sugar?
- (4) Which of the following processes does ciprofloxacin interfere with in order to prevent bacterial growth?(A) Cell wall synthesis (B) DNA repolicsation (C) Electron trsansport (D) Protein Synthesis (E) RNA chain elongation9) Considering the enzymatic reaction catalyzed by HIV protease: Options A) hydrolysis is the net reaction observed. B) a peptide bond is cleaved on the carboxyl side of a proline residue. C) a serine residue serves as the nucleophile during the catalytic event. D) inhibitors have been designed to covalently link to the active site just like natural substrates do. E) None of the above is true. F) All of the above are true.1. Regarding proteins, what is meant by the following terms? A. Zwitterion B. pI C. Isoelectric point D. denaturation E. Catalyst F. Cofactor G. Coenzyme 1a. Why are proteins catalysts known as enzymes necessary to sustain life processes?  1b. Describe the interaction between enzyme and its substrate.