Homework Answers
Ans-14) The initial step in the enzyme catalysis requires- c) recognition of substrate by the enzyme.
In an enzyme catalyzed reaction, an active site is produced in the enzyme.During this process, the enzyme recognizes and fits the specific substrate in a particular direction.
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14. The initial step in enzyme catalysis requires A. a redistribution of electrons B. a transfer...
11. Bacteria can produce approximately _____________ different enzymes A. 250 B. 2,500 C. 25,000 D. 250,000...
11. Bacteria can produce approximately _____________ different enzymes A. 250 B. 2,500 C. 25,000 D. 250,000 12. The first enzyme to be purified was A. an oxidoreductase B. a transferase C. a hydrolase D. a ligase 13. The scientist known for this first purification of an enzyme was A. Pasteur B. Sumner C. Lehninger D. Koshland 14. The initial step in enzyme catalysis requires A. a redistribution of electrons B. a transfer of protons C. recognition of substrate by the...
Are the following examples of general acid/base catalysis, covalent catalysis, catalysis by approximation (proximity effect), or...
Are the following examples of general acid/base catalysis, covalent
catalysis, catalysis by approximation (proximity effect), or
metal-ion catalysis? Complete parts a, b, c, and d.
(b) NMP kinases bring two nucleotides, for example AMP and ATP,
together to facilitate the transfer of a phosphoryl group from one
nucleotide to the other (creating two ADP). The enzyme positions
the adenosine triphosphate (ATP) such that the gamma phosphate
group is placed adjacently to the phosphate group of the NMP
kinase. This facilitates...
14. Which step of reaction requires inorganic phosphate? What is the enzyme? Which enzyme category does...
14. Which step of reaction requires inorganic phosphate? What is the enzyme? Which enzyme category does it belong to? 15. Which step of reaction produces H20 as a byproduct? P-0-CH CH - Glyceraldehyde 3-phosphate Dihydroxyacetone phosphate triose phosphate -O-CH2 -CHCH isomerase 2NAD Ilyceraldehyde oxidation and (b) Payoff phase Oxidative conversion of (2) Glyceraldehyde (21 -0-CH -CH glyceraldehyde 3-phosphate 3-phosphate to pyruvate and the coupled 2P IN 6 formation of ATP and NADH 2NAD I 3 phosphate Jl dehydrogenase phosphorylation 2...
QUESTION 4 Enzyme Z's catalytic power is provided through a transitory covalent linkage between one of...
QUESTION 4 Enzyme Z's catalytic power is provided through a transitory covalent linkage between one of the substrates and the side- chain of a residue in the enzyme, creation of "tunnels" through which substrates can travel toward one another, stabilization of the transition state, and temporary donations of protons from the enzyme to the transition state. This enzyme is operating through O a. chemical catalysis O b. both binding-mode and chemical catalysis O c. neither binding-mode nor chemical catalysis d....
12. Which of the following statements is true of enzyme catalysts? A B C To be...
12. Which of the following statements is true of enzyme catalysts? A B C To be effective, they must be present at the same concentration as their substrate. They can increase the equilibrium constant for a given reaction by a thousand-fold or more. They lower the activation energy for conversion of substrate to product. Their catalytic activity is independent of pH. They are generally equally active on D and L isomers of a given substrate. D E 13. In competitive...
is meant by a "pacemaker" enzyme is an enume that catalyzes the fastest reaction in a...
is meant by a "pacemaker" enzyme is an enume that catalyzes the fastest reaction in a pathway A It is an nuryme the catalyzes the slowest reaction in a pathway c) It is in en ryme that requires a significant energy source to function D) It is an enzyme that requires a co-factor to function E) It is an enzyme that is covalently modified during the reaction process 24. What is the difference bet between the lock-and-key and the induced-fit...
high and detecting one product at a time Question 77 The initial velocity of an enzyme...
high and detecting one product at a time Question 77 The initial velocity of an enzyme reaction (vo) describes A) The concentration of the enzyme at maximal velocity B) The concentration of substrate at maximal velocity C) The concentration of both at the start of the reaction D) The rate of the reaction when the substrate and enzyme are first med Question 78 What is the shape of a typical plot of initial rate vs substrate concentration tres kinetics? A)...
ICE Chapter 7 .) Match each Catalytic Mechanism or Enzyme Mediated Reaction to its description: a....
ICE Chapter 7 .) Match each Catalytic Mechanism or Enzyme Mediated Reaction to its description: a. Act as molecular switches by turning on/off cell signaling and gene expression Acid-Base Catalysis b. Isomerizations, condensations, and Covalent Catalysis dehydrations (hydrolysis) c Nucleophile group on the enzyme attacks an electrophile substrate, forming an enzyme- Metal lon Catalysis substrate intermediate d. Proton transfer involving water or a functional group Coenzyme Dependent Redox Reactions e. Include dehyd rogenases. Involves NAD /NADH, NADP*/NAD PH, FAD/FADH2, FMN/FMNH2...
Which statement about enzyme catalyzed reactions is not true? a) enzymes form complexes with their substrates....
Which statement about enzyme catalyzed reactions is not true? a) enzymes form complexes with their substrates. b) enzymes lower the activation energy for chemical reactions. c) enzymes change the K eq for chemical reactions. d) many enzymes change shape slightly when substrate binds. e) reactions occur at the "active site" of enzymes, where a precise 3D orientation of amino acids is an important feature of catalysis.
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form complexes with their substrates b. Enzymes lower the activation energy for chemical reactions c. Enzymes change the Key for chemical reactions d. Many enzymes change shapes slightly when substrate binds 10. To overcome an energy barrier between reactants and products, energy must be provided to get the reaction started. This energy, which is recovered as the reaction proceeds, is called: a. Activation energy b....
Are the following examples of general acid/base catalysis, covalent
catalysis, catalysis by approximation (proximity effect), or
metal-ion catalysis? Complete parts a, b, c, and d.
(b) NMP kinases bring two nucleotides, for example AMP and ATP,
together to facilitate the transfer of a phosphoryl group from one
nucleotide to the other (creating two ADP). The enzyme positions
the adenosine triphosphate (ATP) such that the gamma phosphate
group is placed adjacently to the phosphate group of the NMP
kinase. This facilitates...
14. Which step of reaction requires inorganic phosphate? What is the enzyme? Which enzyme category does it belong to? 15. Which step of reaction produces H20 as a byproduct? P-0-CH CH - Glyceraldehyde 3-phosphate Dihydroxyacetone phosphate triose phosphate -O-CH2 -CHCH isomerase 2NAD Ilyceraldehyde oxidation and (b) Payoff phase Oxidative conversion of (2) Glyceraldehyde (21 -0-CH -CH glyceraldehyde 3-phosphate 3-phosphate to pyruvate and the coupled 2P IN 6 formation of ATP and NADH 2NAD I 3 phosphate Jl dehydrogenase phosphorylation 2...
QUESTION 4 Enzyme Z's catalytic power is provided through a transitory covalent linkage between one of the substrates and the side- chain of a residue in the enzyme, creation of "tunnels" through which substrates can travel toward one another, stabilization of the transition state, and temporary donations of protons from the enzyme to the transition state. This enzyme is operating through O a. chemical catalysis O b. both binding-mode and chemical catalysis O c. neither binding-mode nor chemical catalysis d....
12. Which of the following statements is true of enzyme catalysts? A B C To be effective, they must be present at the same concentration as their substrate. They can increase the equilibrium constant for a given reaction by a thousand-fold or more. They lower the activation energy for conversion of substrate to product. Their catalytic activity is independent of pH. They are generally equally active on D and L isomers of a given substrate. D E 13. In competitive...
is meant by a "pacemaker" enzyme is an enume that catalyzes the fastest reaction in a pathway A It is an nuryme the catalyzes the slowest reaction in a pathway c) It is in en ryme that requires a significant energy source to function D) It is an enzyme that requires a co-factor to function E) It is an enzyme that is covalently modified during the reaction process 24. What is the difference bet between the lock-and-key and the induced-fit...
high and detecting one product at a time Question 77 The initial velocity of an enzyme reaction (vo) describes A) The concentration of the enzyme at maximal velocity B) The concentration of substrate at maximal velocity C) The concentration of both at the start of the reaction D) The rate of the reaction when the substrate and enzyme are first med Question 78 What is the shape of a typical plot of initial rate vs substrate concentration tres kinetics? A)...
ICE Chapter 7 .) Match each Catalytic Mechanism or Enzyme Mediated Reaction to its description: a. Act as molecular switches by turning on/off cell signaling and gene expression Acid-Base Catalysis b. Isomerizations, condensations, and Covalent Catalysis dehydrations (hydrolysis) c Nucleophile group on the enzyme attacks an electrophile substrate, forming an enzyme- Metal lon Catalysis substrate intermediate d. Proton transfer involving water or a functional group Coenzyme Dependent Redox Reactions e. Include dehyd rogenases. Involves NAD /NADH, NADP*/NAD PH, FAD/FADH2, FMN/FMNH2...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form complexes with their substrates b. Enzymes lower the activation energy for chemical reactions c. Enzymes change the Key for chemical reactions d. Many enzymes change shapes slightly when substrate binds 10. To overcome an energy barrier between reactants and products, energy must be provided to get the reaction started. This energy, which is recovered as the reaction proceeds, is called: a. Activation energy b....
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