Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134042435
Author: Michael D. Johnson
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 13TY
Which of the following is true regarding enzymes?
a. The synthesis of an enzyme involves hydrolysis reactions.
b. Enzymes provide energy for biochemical reactions.
c. One enzyme can catalyze many different types of reactions.
d. The instructions for the synthesis of an enzyme are found in DNA.
e. Each enzyme molecule can be used only once.
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Which of the following is NOT true of enzymes?
a) They may interact chemically with their substrates
b) They may catalyze a reaction in both forward and reverse directions.
c) They may alter Keq for the reaction that they catalyze.
d) They may decrease the entropy of their substrates.
Which 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 catalyze
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.
Chapter 2 Solutions
Human Biology: Concepts and Current Issues (8th Edition)
Ch. 2 -
1. Who do you think should be responsible for...Ch. 2 - Prob. 2QCCh. 2 - Describe the electrical charges and relative...Ch. 2 -
2. Explain why two atoms of hydrogen tend to...Ch. 2 -
3. Explain why polar and charged molecules tend...Ch. 2 - How is a covalent bond different from an ionic...Ch. 2 - Compare and contrast potential energy and kinetic...Ch. 2 - Distinguish between saturated and unsaturated...Ch. 2 - Describe the process known as dehydration...Ch. 2 - Explain why proteins come in an almost unlimited...
Ch. 2 -
9. Discuss the importance of enzymes in living...Ch. 2 -
10. Describe the role of ATP in energy transfer...Ch. 2 - If a molecule of starch is repeatedly hydrolyzed,...Ch. 2 - Which of these molecules would be described as...Ch. 2 -
3. _______bonds form between the oxygen and...Ch. 2 - 13C and 14C are ______ of carbon. a. isotopes b....Ch. 2 - Which of the following substances has the lowest...Ch. 2 - When sugar is dissolved in water, sugar is the...Ch. 2 - A monosaccharide is to a polysaccharide as an...Ch. 2 -
8. Which of these bonds is the easiest to...Ch. 2 -
9. The primary structure of a protein is...Ch. 2 -
10. DNA ultimately contains the instructions for...Ch. 2 - If one strand of DNA has the sequence...Ch. 2 - Which of the following is true regarding the...Ch. 2 -
13. Which of the following is true regarding...Ch. 2 - Synthesis of proteins requires the input of...Ch. 2 - Prob. 15TYCh. 2 - Prob. 1AWKCh. 2 - Prob. 2AWKCh. 2 - Many people use cholesterol-lowering drugs to...Ch. 2 - Prob. 4AWKCh. 2 -
5. Coca-Cola is a very acidic drink; its pH is...
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- 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_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_forwardWhat 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_forward
- 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.arrow_forwardWhich of the following statements are correct about how enzymes accelerate chemical reactions (select all that apply)? A. Enzymes bind substrates to raise their effective concentration B. Enzymes enhance the rate of a chemical reaction C. Enzymes catalyze chemical reactions by destabilizing transition states D. Side chains of protein provide reactive groups that facilitate reaction E. Enzymes shift the equilibrium of a chemical reaction to favor product formationarrow_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
- the ability to carry out biochemical reactions is?arrow_forwardBriefly discuss three (3) reasons why enzyme reactions are better than its chemical reactions counterparts.arrow_forwardThere may be more than correct answer for each Which of the following statements regarding enzymes are correct? a.) Enzymes lower activation energy b.) Enzymes are synthesized in the mitochondria c.) Enzymes show a high degree of specificity for substrates. d.) Enzymes stabilize intermediates The ability of DNA to denature is important for which of the following processes? a.) DNA synthesis b.) nucleic acid hybridization experiments c.) RNA synthesis d.) formation of biomembranesarrow_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 of the following describes a reaction that requires substrate 1 to bind the the enzyme, then substrate 2 binds, and then the products are produced? A. No ternary complex B. Ordered ternary complex C. Ping-Pong D. Random ternary complexarrow_forwardproteins function to give structure to the body, regulate processes, provide protection, help muscles to contract,transport substances and serve as enzymes. As enzymes,proteins serves to: a.Lower the activation energy of biochemical reactions b.speed up biochemical reactions c.orient colliding molecules d.all of the above e.only two of the abovearrow_forward
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