Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 6, Problem 13RQ
Which of the following is not true about enzymes
- They increase ?G of reactions
- They are usually made of amino acids
- They lower the activation energy of
chemical reactions - Each one is specific to the particular substrate(s) to which it hinds.
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Which of the following characteristics of the transition state is false?
The number of noncovalent bonds increases between the enzyme and substrate at its transition state
The transition state energy is part of the delta G ^0 for the reaction
The energy required to reach the transition state is characterized by delta G (double arrow)
The transition state is unstable due to the straining of the covalent bonds in the substrate
Both answers B and C are false
Each enzyme has a specific
which is the reactant that the enzyme will act upon.
Induced Fit Model of Enzyme Action: The substrate induces a more complete fit of the active site around it.
Active site can lower an EA barrier by:
ງ
Below which is false about enzyme and catalysis?
O Catalytic residues interact with substrates and help substrates reach "transition state".
Catalytic residues may be far away from each other in the protein sequence.
Enzymes go through changes when binding to substrates, but the changes are always temporary.
During catalysis, enzymes never form covalent bonds with substrates.
O During catalysis, enzymes may serve as an acid or a base.
Chapter 6 Solutions
Biology 2e
Ch. 6 - Figure 6.8 Look at each of the processes shown,...Ch. 6 - Figure 6.10 If no activation energy were required...Ch. 6 - Figure 6.14 The hydrolysis of one ATP molecule...Ch. 6 - Energy is stored long-term in the bonds of and...Ch. 6 - DNA replication involves unwinding two strands of...Ch. 6 - Consider a pendulum swinging. Which type(s) of...Ch. 6 - Which of the following comparisons or contrasts...Ch. 6 - Which of the following is the best way to judge...Ch. 6 - Which of the following is not an example of an...Ch. 6 - In each of the three systems, determine the state...
Ch. 6 - The energy released by the hydrolysis of ATP is...Ch. 6 - Which of the following molecules is likely to have...Ch. 6 - Which of the following is not true about enzymes...Ch. 6 - An allosteric inhibitor does which of the...Ch. 6 - Which of the following analogies best describes...Ch. 6 - Does physical exercise involve anabolic and/or...Ch. 6 - Name two different cellular functions that require...Ch. 6 - Explain in your own words the difference between a...Ch. 6 - Describe the position of the transition state on a...Ch. 6 - Imagine an elaborate ant farm with tunnels and...Ch. 6 - Energy transfers take place constantly in everyday...Ch. 6 - Do you think that the Ea for ATP hydrolysis is...Ch. 6 - With regard to enzymes, why are vitamins necessary...Ch. 6 - Explain in your own words how enzyme feedback...
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- Enzymes _______. a. enhance reaction rates b. are affected by pH c. act on specific substrates d. all of the abovearrow_forwardThe capacity to do work best defines: a metabolic pathway. entropy. kinetic or potential energy. a chemical equilibrium. thermodynamics.arrow_forwardWhich of the following is not true about enzymes? a. They are consumed by the reactions they catalyze. b. They are usually made of amino acids. c. They lower the activation energy of chemical reactions. d. Each one is specific to the particular substrate(s) to which it binds.arrow_forward
- Enzymes have all the following characteristics except: a. they act as biological catalysts b. they are proteins c. they carry out random chemical reactions d. they convert substrates into products e. they can cause genetic diseasearrow_forwardWhich of the following statements is false regarding an enzyme's ability to catalyse a reaction? an enzyme provides a reaction surface and a hydrophilic environment for the reaction to take place an enzyme binds reactants such that they are positioned correctly and can attain their transition-state configurations an enzyme allows the reaction to go through a more stable transition state than would normally be the case an enzyme can weaken bonds in reactants through the binding processarrow_forwardWhich of the following is NOT true about enzymes? Enzyme inhibitors interact reversibly or irreversibly with an enzyme to alter its Km and /or Vmax values. Enzymes typically act under milder conditions of temperature and pH than non-enzyme chemical catalysts. Zymogens are the inactive precursors of enzyme. Nucleophilic groups can catalyze reactions through the transient formation of covalent bonds with the substrate. Transition state stabilization can significantly increase the activation energy for a reaction.arrow_forward
- Which of the following statements is not true about enzymes? * Our bodies naturally produce enzymes The substance that the enzyme bind is called active site An enzyme may bind to two or more substrates giving the product. An enzyme may bind to one substrate giving more than one product.arrow_forwardWhich factor does NOT represent a barrier that prevents a reaction from taking place? substrate distortion the solvation shell of hydrogen-bonded water entropy of the molecules in solution standard free-energy change the need for proper alignment of catalytic functional groups on the enzymearrow_forwardWhich of the following statements about competitive inhibitors of an enzyme catalyzed reaction is correct? The inhibition can be overcome by increasing substrate concentration to a very high level One enzyme molecule can bind to both the inhibitor and the substrate at the same time at the active site O They don't change the Km ( They decrease the Vmaxarrow_forward
- Which of the following statements is true about effect of substrate concentration on enzyme activity ? The rate of reaction increases as the substrate concentration increases up to certain limit at which the reaction rate is maximal (Vmax.) At Vmax, the enzyme is completely saturated with the substrate, At Vmax, any increase in substrate concentration don't affect the reaction rate. All of themarrow_forwardWhich of the following do enzymes change?∆G ; reaction rate; types of product generated; activation energy; the laws ofthermodynamics.arrow_forwardIn which of the following is the pairing between enzyme type and enzyme function incorrect? mutase - conversion of one structural isomer into another O oxidase - oxidation of a substrate carbohydrases - hydrolysis of glycosidic bonds in carbohydrates O dehydrogenase - removal of water from substratearrow_forward
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