BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 6, Problem 6A
Summary Introduction
Introduction:
For the efficient operation of the biochemical pathway, the activity of the reactions in that pathway needs to be regulated and coordinated. In circumstances when the product of the reaction is plenty, in those situations synthesizing more products would be wastage of energy. One of these regulatory mechanisms is known as the feedback inhibition.
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The mechanism in which the end product of a metabolic pathway inhibits an either step in the pathway is known as
A. Reversible inhibition
B. Metabolic inhibition
C. Feedback inhibition
D. Allosteric inhibition
E. Noncoopetative inhibition
What distinguishes a linear metabolic pathway from a cyclic metabolic pathway?
A. The last step of the pathway regenerates a reactant for the first step.
B. The product inhibits an enzyme in the pathway, slowing or stopping the metabolic pathway.
C. A linear pathway runs straight in one direction from reactant to product.
D. Enzymes convert reactants into intermediates before separate enzymes convert intermediates into products.
An enzyme has the ability to catalyze reactions of several unrelated compounds. The mechanism of how this enzyme operates is best explained by
a. the lock-and-key theory
b. the induced-fit theory
c. the enzyme-substrate complex
d. the efficiency of the enzyme
Chapter 6 Solutions
BIOLOGY
Ch. 6.1 - Prob. 1LOCh. 6.1 - Prob. 2LOCh. 6.1 - Describe the nature of redox reactions.Ch. 6.2 - Explain the laws of thermodynamics.Ch. 6.2 - Prob. 2LOCh. 6.2 - Contrast the course of a reaction with and without...Ch. 6.3 - Describe the role of ATP in short-term energy...Ch. 6.3 - Prob. 2LOCh. 6.4 - Discuss the specificity of enzymes.Ch. 6.4 - Explain how enzymes bind to their substrates.
Ch. 6.4 - Prob. 3LOCh. 6.5 - Prob. 1LOCh. 6.5 - Prob. 2LOCh. 6.5 - Prob. 3LOCh. 6 - Prob. 1DACh. 6 - A covalent bond between two atoms represents what...Ch. 6 - During a redox reaction the molecule that gains an...Ch. 6 - Prob. 3UCh. 6 - A spontaneous reaction is one in which a. the...Ch. 6 - Prob. 5UCh. 6 - Which of the following is NOT a properly of a...Ch. 6 - Where is the energy stored in a molecule of ATP?...Ch. 6 - Prob. 1ACh. 6 - Which of the following statements is NOT true...Ch. 6 - Prob. 3ACh. 6 - Prob. 4ACh. 6 - Enzymes have similar responses to both changes in...Ch. 6 - Prob. 6ACh. 6 - Examine the graph showing the rate of reaction...Ch. 6 - Phosphofructokinase functions to add a phosphate...
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- How could you use the diversity of metabolic pathways that produce the same or similar products to critique this argument? Rank the steps from first to last. a. New enzymes cause modification of the pathway in an advantageous way. b. The biochemical pathway is gradually modified. c. A pathway exists and accomplishes some functions. d. An organism with cellular enzymes has mutations that allow new enzymes to arise.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_forwardIn a highly high-temperature environment, you placed an enzyme and some substrates. You've seen that there hasn't been any reaction. Applying what you have learned on enzyme activity, how would you explain what occurred? A. The enzyme was not placed at a pH level that would allow it to react at its maximum rate. B. There are not enough enzymes for the reaction to occur. C. The enzyme may have denatured or broken down due to the high temperature of the environment, resulting in no reaction. D. There are not enough substrates for reaction to occur. Substrate concentration affects enzyme activity. Determine what would occur when there are too many substrates and fewer enzymes? A. No enzyme activity would occur. B. The reaction rate would continuously increase. C. The reaction would speed up tremendously. D. Maximal rate of reaction would occur. Enzyme activity mainly involves the active site and the substrate. How would you compare the active site from the substrate? A. The substrate…arrow_forward
- Enzymes work by at least three mechanisms. Which of the following is NOT a mechanism by which enzymes function? A. by putting reactants in close proximity to each other. B. by altering the free energy ( ΔG) of the reaction. C. by orienting the reactants so they are positioned to favour the transition state. D. by altering the immediate environment of the reactants to promote reactant interactions.arrow_forwardWhich type of enzyme regulation is best for the following situations?(a) An enzyme that becomes overactive during a disease(b) An enzyme needed only when there is low blood glucose(c) An enzyme that springs into action when a traumatic injury occurs(d) An enzyme needed only during adolescencearrow_forwardthe type of enzyme inhibition in which covalent bulky adduct prevents catalysis is ? a) uncompetitive b) reversible c) noncompetitive d) competitive e) Irreversiblearrow_forward
- Which 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_forwardEnzymes have similar responses to both changes in temperature and pH. The effect of both is on the a. rate of movement of the substrate molecules. b. strength of the chemical bonds within the substrate. c. three-dimensional shape of the enzyme. d. rate of movement of the enzyme.arrow_forwardWhat is the reason why the transition state of a catalyzed reaction is lower has lower energy compared to an uncatalyzed reaction? A. because enzymes only work at low temperatures B. because of favorable interactions with the substrate C. because of enthalpic interactions between the enzyme and the transition state D. A and Barrow_forward
- What roles do enzymes play in nature? Group of answer choices A.They have a role in metabolic reactions B. They increase rates of reaction but do not shift the equilibrium formed between products and reactants C. They catalyze cellular processes D. All of the abovearrow_forwardMolecule X is expected to be a non-competitive inhibitor of an enzyme. If the inhibitor was tested at a saturating level of substrate the following would be observed: a. The inhibitor would decrease the Vmax b. The inhibitor would increase the Km c. The inhibitor would decrease the Km d. The inhibitor would increase the Vmax e. The inhibitor would not change the Vmaxarrow_forwarda primary reason that enzymes are necessary to life is that a. the are portenin coded for in DNA b. activation energies of most biological reactions are too high for the reaction to proceed fast enough for a cells requirements c. activation energies of most biological reactions are too low for the reaction to proceed fast enough for a cells requirements d. enzymes are helpful to life, but not necessaryarrow_forward
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