Hi, Can someone please answer me some of these questions? Thank you very much! H

Question

Hi, Can someone please answer me some of these questions? Thank you very much!

Hi, Can someone please answer me some of these questions? Thank you very much!

Some practice questions to try before for exam 2, This is not a full review of everything covered. However, I think you should be able to answer all of these 1) Which of the following argtrueóf e ts: They changethe e B) To be effective, the enzyme concentration must exceed the substrate concentration. GEnzy constant of a reaction to favor the formation of products. pro mes decrease the activation energy for conversion of substrate to product. D) Enzymes increase the rate of a reaction by adding energy to the substrates. E) Enzymes may be made of protein or RNA. 2) An enzyme catalyzes the conversion of substrate ISI to product [Pl at pH 6 The AG for the reaction is +3.0 k/mole. Which of the following statements are true A) The enzyme will convert all of the substrate to product B) The enzyme will not convert any of the substrate to product. C) The enzyme will convert substrate to product, but only until [S]-[P] D) When the reaction reaches equilibrium, [S] will be greater than [P E) When the reaction reaches equilibrium, [P] will be greater than [S 3) A student working in a research lab is characterizing a form of trypsin, where a glutamate that is normally in this trypsin's substrate binding pocket has been changed to leucine. How would the glutamate-to-leucine mutation alter the KM for the enzyme? A) The glutamate-to-leucine mutation would most likely increase the KsM B) The glutamate-to-leucine mutation would most likely decrease the KM. C) The glutamate-to-leucine mutation would most likely not change the KM. 4) (a) A student working in a research lab prepared a mutant version of a serine protease, where the aspartate within the catalytic triad was changed to alanine. How would this mutation of the aspartate likely effect the kcat of the enzyme? A) The aspartate-to-alanine mutation likely lowered the kcat of the enzyme. B) The aspartate-to-alanine mutation likely raised the kcat of the enzyme. C) The aspartate-to-alanine mutation likely did not change the kcat. 6) Cysteine proteases are catalytically homologous to serine proteases, where the activ site serine is replaced with a cysteine. Draw the mechanism used by a cysteine proteas up to and including the formation of the first tetrahedral intermediate (ie show all e, arrow pushing). 7) (a) Consider a simple enzyme catalyzed reaction, where an enzyme (E) catalyzes the conversion of substrate (S) to product (P) in a reaction with AG 0 k]/mole. Assume reaction is described by E + S ES

Explanation / Answer

1.Enzyme catalysts decrease the activation energy for conversion of substrates to products. This is done by increasing the amount of reactant molecules which achieve a sufficient amount of energy so as to catalyse the reaction. Moreover, the macromolecular components of all enzymes are composed of protein, except for a class of RNA modifying enzymes known as ribozymes. They increase the rate of chemical reaction by providing energy molecules to substrate. So, options C,D,E are correct.

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