Which of the following is incorrect about the chymotrypsin mechanism? a. When His removes a proton from Ser, it is acting as an acid Ob. Asp does not act as an acid O c. Asp, through a H-bond, holds His in the proper orientation Od. After being deprotonated, Ser acts as a nucleophile
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- Which of the following is incorrect about the chymotrypsin mechanism? a. The (-) charge of oxygen in the transition state is stabilized by the oxyanion hole Ob. Asp does not act as a nucleophile Oc. After H₂O had a proton removed, the OH acts as a nucleophile Od. When His removes a proton from H₂O, it is acting as an acidWhich one of the following best describes the role of water in the reaction that is catalyzed by chymotrypsin? choose the best answer based on your coverage. Water forms several H-bonds with the transition state to stabilize it. Water deprotonates the Ser, converting Ser into a strong nucleophile. Water is a product of the reaction. His deprotonates the water, converting the water into a strong nucleophile. Water serves as a catalyst, being consumed and then regenerated in the reaction.Which of the following is false about chymotrypsin? A Hydrolytic cleavage of a peptide bond by chymotrypsin involves two nucleophilic attacks to the substrate B It is activated in the presence of trypsin C It is synthesized in the thyroid gland D Polypeptide chains in chymotrypsin are linked by S-S bonds
- Carbon monoxide competes with hemoglobin for 02 binding, resulting in toxicity. Is it possible that carbon monoxide is an allosteric effector? No, since it competes with the molecule O for the active site. Yes, since it will minimize the amount of 02 binding. O Yes, since it competes with the molecule O for the active site. No, since it is a negative effector that reduces 02 binding.Regarding the mechanism of action of chymotrypsin, the formation of a strong hydrogen bond with the hydroxyl group (serine amino acid) increase its: Basicity Nucleophilicity All the answers are correct Electron densityThe role of Zn2+ in catalysis is usually to: a. Stabilize a (-) charge in the transition state O b. Act as a nucleophile Oc. Act as a base Od. Destabilize a (-) charge in the transition state
- A defect in which of the following enzymes leads to Tay- Sachs disease? O Phospholipase CO a-galactosidase A O Hexosamidase A O SphingomyelinaseAllosteric inhibitors of hemoglobin will decrease enzyme activity (oxygen binding) through which of the following mechanisms? Binding the enzyme in "T" conformation and displacing an activator Binding the enzyme and enhancing the Vmax Binding the enzyme, and keeping it in the "R" conformation Binding the enzyme, and keeping it in the "T" conformationWhat are the effects of different light colors in photosynthesis? Different light colors will change the rate of photosynthesis Light color does not affect photosynthesis Carbohydrates are metabolized by light Photosynthesis does not require light
- Which of the following statements is true about the chymotrypsin reaction? 1. The catalytic triad at the active site is formed by three residues: His, Gly, and Ser 2. When the substrate is p-Nitrophenylacetate, the rate-limiting step is the release of p-Nitrophenolate. 3. During the reaction, LBHB forms when the proton is donated to His from Ser or water. 4. The chymotrypsin reaction involves “only” specific acid-base catalysis 5. The “oxyanion hole” is formed by the amide nitrogens of Ser and GluWhich of the following amino acid residues cannot play a role in acid-base catalysis? a. Aspartate Ob. Phenylalanine c. Glutamate Od. HistidineWhich of the following is an example of anapleurotic reaction