10/05/2020Enzymes(Senior Class Biology Study by Topics) 0Comments by Gate Academy Please fill in the information below. NAME EMAIL PHONE NUMBER 1. The following is the right optimal pH for most enzymes and stomach enzymes except? PH 6 - 8 for most enzymes. PH of 2 for stomach enzymes PH 5 - 9 for most enzymes. All of the above2. Which of the following is NOT true about enzymes? Enzymes are proteins Enzymes lower the activation energy Enzymes react with the substrate in a chemical reaction. Enzymes catalyzes chemical reactions3. Which line in the graph shows the presence of an enzyme in a chemical reaction? Line 2 Line 14. Cellulose is a tough component of plant fiber. Animals such as cows, horses and goats are able to digest cellulose because of their enzyme called ___________(leave answer in lowercase)5. What is the function of phosphorylase? Use H2O2 as the electron acceptor Transfer amino group Transfer inorganic phosphate Transfer a carboxylate group6. Co factors are Organic co factors Interfere with protein bonds Non protein substances that help to facilitate enzymes Trigger enzyme to quit producing insulin7. Which of the following is an example of ligases enzyme? Racemases Epimerases Mutases Carboxylases8. ___________ inhibitors change the shape of an enzyme. Nondistributive Noncompetitive Competititve Distributive9. Name the coenzyme of riboflavin (B2)? Coenzyme A Thiamine pyrophosphate FAD and FMN NAD or NADP10. A __________is a biocatalyst that increases the rate of the reaction without being changed. Aluminum oxide Enzyme Hydrogen peroxide Silicon dioxide11. Name the enzyme secreted by pancreas? Pepsin Chymotrypsin Trypsin Alcohol dehydrogenas12. _____ is required to start a reaction. (leave answer in lowercase)13. Which of the following reaction is catalyzed by Lyase? Intramolecular rearrangement of bonds Transfer of group from one molecule to another Formation of bonds Breaking of bonds14. Which of the following enzyme is responsible for the regulation of biological nitrogen fixation? Phosphatase Kinase Dinitrogenase reductase Dinitrogenase oxidase15. Which of the following enzyme is responsible for the regulation of biological nitrogen fixation? Dinitrogenase reductase Dinitrogenase oxidase Phosphatase Kinase16. Which of the following is false about feedback regulation? The synthesis of concerned enzyme is inhibited by interfering with the gene of that enzyme Concentration of enzyme is reduced by the end product The best example is the biosynthesis of L-isoleucine from L-threonine in bacteria It is a type of enzymatic activity regulation17. The attachment of phosphoryl groups to specific amino acid residues is catalyzed by ______ Protein kinases Protein phosphatases Diphteria toxin and cholera toxin Dinitrogenase reductase18. Which of the following is false about allosteric feedback inhibition? Conversion of L-leucine to L-isoleucine Bacterial enzyme system is the first known example Threonine dehydratase is inhibited by isoleucine If the isoleucine concentration decreases, the rate of threonine dehydration increases19. Inhibitors are Look like the substrate Fight for position Use the active site Chemical that interfere with enzyme activity20. Which of this vitamin is associated with the coenzyme Biocytin? Thiamine Pyridoxine Nicotinic acid Biotin21. Which of the following takes place due to phosphorylation of isocitrate dehydrogenase? No reaction Inhibits the binding of citrate at active site Degrades the enzyme Enhances the substrate-binding affinity22. Enzymes end in - ase True False23. Competitive Inhibitor Triggers enzyme to quit producing insulin All of the above Has the same molecular shape of substrate Looks like substrate24. Enzymes are reaction specific ( each reaction has a specific enzyme that catalyzes it) True False25. The following are correct about enzyme inhibitors except? All of the above Noncompetitive inhibitors bind to the allosteric site of an enzyme Noncompetitive inhibitors bind to the active site of an enzyme. Competitive inhibitors bind to the active site of an enzyme.26 out of 25Time is Up!
