Laboratory Manual For Human Anatomy & Physiology
4th Edition
ISBN: 9781260159363
Author: Martin, Terry R., Prentice-craver, Cynthia
Publisher: McGraw-Hill Publishing Co.
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Textbook Question
Chapter 55, Problem 5PL
As temperatures decrease, enzyme activity
a. increases.
b. remains unchanged.
c. ceases.
d. decreases.
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Which of these statements about enzymes is true? a,Most proteins are enzymes. b.Most enzymes are proteins. c.Enzymes are changed by the reactions they catalyze. d.The active sites of enzymes have little specificity for substrates.
In 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…
Which of the following is not true about enzymes: a. They increase ΔG of reactions. 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.
Chapter 55 Solutions
Laboratory Manual For Human Anatomy & Physiology
Ch. 55 - The enzyme amylase accelerate s the reaction of...Ch. 55 - Amylase originates from a. salivary glands and...Ch. 55 - The optimum pH for amylase activity is a. 014 . b....Ch. 55 - After an enzyme reaction is completed, the enzyme...Ch. 55 - As temperatures decrease, enzyme activity a....Ch. 55 - Prob. 6PLCh. 55 - The change of the unique three-dimensional shape...Ch. 55 - Test results:Ch. 55 - Test results:
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- Enzymes 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_forwardWhich of the following statement regarding enzymes is false? a.) they speed up reaction rates b.) they work within narrow temperature and pH ranges c.) The active site binds the substarate d.) They are consumed in the reactions they catalyzearrow_forwardChoose the best description of an enzyme: (a) It allows a chemical reaction to proceed extremely fast. (b) It increases the rate at which a chemical reaction approaches equilibrium relative to its uncatalyzed rate. (c) It makes a reaction thermodynamically favorable.arrow_forward
- Which of the following statements regarding enzymes is true? A. Enzymes decrease the free energy change of a reaction. B. Enzymes cjange the direction of chemical reaction. C. Enzymes prevent changes in substrate concentrations. D. Enzymes increase the rate of a reaction. E. Enzymes are permanently altered by the reactions they catalyze.arrow_forwardFactors that affect the activity of an enzyme molecule includea. the potential energy stored in the reactant molecules.b. size of the cell.c. temperature and pH.d. entropyarrow_forwardAn enzyme __________ the activation energy required for a chemicalreaction.a. increases b. converts c. lowers d. catalyzesarrow_forward
- Which of the following accurately describes how an enzyme functions? a. reduces the energy content of the products b. allows for the exothermic reaction of materials that are usually endothermic c. changes the reaction mechanism effectively reducing the activation energy d. shifts the equilibrium for the reactionarrow_forwardThe following statement can be said about enzymes: A. lowers activation energy of reactions B. regulates chemical activities in the body C. 3D shape is essential for normal function D. all of these E. B and C onlyarrow_forwardwhat is the first step in an enzyme-catalyzed reaction? a. formation of enzyme-substrate complex b. ionization of enzyme c. dimerizing the substance d. catalysis of enzymearrow_forward
- How does an enzyme affect a chemical reaction? Select all that apply. A. Lowers the activation energy B. Decreases the rate of the reaction C. Increases the activation energy D. Increases the rate of the reactionarrow_forwardFor reactions to occur there needs to be what level of substrate and enzyme concentrations? Select one: a. Greater amount of substrate b. Lower amount of substrate c. Just the right amount of substratearrow_forwardWhich of the following choices BEST describes metabolism? a. breakdown of biomolecules b. controlled by enzymes and involved ATP c. all of the choices are correct d. synthesis of biomoleculesarrow_forward
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