15. Which one of the following is not among the six internationally accepted classes of enzymes? a. b. له دل و C. d. e.

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15. Which one of the following is not among the six internationally accepted classes of enzymes? a. b. له دل و C. d. e. 16. a. b. C. d. Which one of the following statements is true for enzyme catalysts? They increase the equilibrium constant for a reaction, thus favoring product formation. They bind to substrates, but are never covalently attached to substrate or product. To be effective, they must be present at the same concentration as their substrates. They increase the stability of the product of a desired reaction by allowing ionizations, resonance, and isomerizations not normally available to substrates. They lower the activation energy for the conversion of substrate to product. e. Transferases Hydrolases Transcriptases Oxidoreductases Ligases b. C. d. 17. You intend to design a combi CLEA (Cross-Linked Enzyme Aggregate) to treat lignocellulose more efficiently to obtain biofuels. Which enzymes would you use? Cellulase, Laccase and Lipase Cellulase, Lyase, and beta 1,3 glucanase. Cellulase, Lyase, and Laccase Cellulase, Xylanase, and beta 1,3 glucanase 18. Which statement about amylases is true? a. beta-amylases catalyze the cleavage of internal alpha-1,4-glycosidic linkages in starch in low molecular weight products as glucose, maltose and maltotriose units. b. alpha-amylases catalyze the cleavage of alpha-1,4-glycosidic linkages so as to remove successive maltose units from the non-reducing ends of the chains. all of the answers C. d. gamma-amylases catalyze the cleavage of alpha-1,6-glycosidic linkages, as well as the last alpha-1,4-glycosidic linkages at the non-reducing end of amylose and amylopectin.