Anatomy & Physiology (6th Edition)
6th Edition
ISBN: 9780134156415
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 22MC
Enzymes are organic catalysts that (a) alter the direction in which a
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Which statement is true regarding the function of a catalyst in a chemical reaction? a) A catalyst increases the rate of a reaction. b) A catalyst provides an alternate mechanism for the reaction. c) A catalyst is not consumed by the reaction. d) All of the above are true.
Which of the following is true about enzymes.
a) Enzymes are catalysts and they increase the rate of a reaction while they are not altered by the reaction.
b) Enzymes are proteins that can be denatured by changes in pH or temperature.
c) Enzymes are highly specific for the substrates they react with and catalyze only one or a limited set of possible reactions with those substrates.
d) All of these are true about enzymes
e) None of these are true about enzymes
Which of the following statements about enzymes are true? Choose all that apply.
Group of answer choices:
a) Enzymes are nonspecific
b) Enzymes speed up the rates of chemical reactions
c) Enzymes require a lot of energy to synthesize
d) Enzymes are not important in biological systems
E) Reactants in enzyme-catalyzed reactions are called substrates
F) Enzymes lower the activation energy of reaction
G) Enzymes change ∆G of reactions
H) One enzyme usually catalyzes many types of reactions
I answered for letters , B, E, anf F, and got a 1.5 out of 2, so I am missing one.
Thank You!
Chapter 2 Solutions
Anatomy & Physiology (6th Edition)
Ch. 2.1 - What form of energy is found in the food we eat?Ch. 2.1 - What form of energy is used to transmit messages...Ch. 2.1 - What type of energy is available when we are...Ch. 2.2 - What two elements besides H and N make up the bulk...Ch. 2.2 - An element has a mass of 207 and has 125 neutrons...Ch. 2.2 - How do the terms atomic mass and atomic weight...Ch. 2.3 - What is the meaning of the term molecule?Ch. 2.3 - Why is sodium chloride (NaCl) considered a...Ch. 2.3 - Blood contains a liquid component and living...Ch. 2.4 - What kinds of bonds form between water molecules?
Ch. 2.4 - Oxygen (8O) and argon (18A) are both gases. Oxygen...Ch. 2.4 - Assume imaginary compound XY has a polar covalent...Ch. 2.5 - Which reaction type-synthesis, decomposition, or...Ch. 2.5 - Why are many reactions that occur in living...Ch. 2.5 - What specific name is given to decomposition...Ch. 2.6 - Salts are electrolytes. What does that mean?Ch. 2.6 - Which ion is responsible for increased acidity?Ch. 2.6 - To minimize the sharp pH shift that occurs when a...Ch. 2.6 - Prob. 19CYUCh. 2.7 - Prob. 20CYUCh. 2.8 - What are the monomers of carbohydrates called?...Ch. 2.8 - What is the animal form of stored carbohydrate...Ch. 2.9 - Prob. 23CYUCh. 2.10 - What does the name amino acid tell you about the...Ch. 2.10 - What is the primary structure of proteins?Ch. 2.10 - What are the two types of secondary structure in...Ch. 2.10 - How do enzymes reduce the amount of activation...Ch. 2.11 - How do DNA and RNA differ in the bases and sugars...Ch. 2.11 - What are two important roles of DNA?Ch. 2.12 - Glucose is an energy-rich molecule. So why do body...Ch. 2.12 - What change occurs in ATP when it releases energy?Ch. 2 - Which of the following forms of energy is the...Ch. 2 - All of the following are examples of the four...Ch. 2 - The mass number of an atom is (a) equal to the...Ch. 2 - A deficiency in this element can be expected to...Ch. 2 - Which set of terms best describes a proton? (a)...Ch. 2 - The subatomic particles responsible for the...Ch. 2 - Prob. 7MCCh. 2 - Which of the following does not describe a...Ch. 2 - In a beaker of water, the water-water bonds can...Ch. 2 - When a pair of electrons is shared between two...Ch. 2 - Molecules formed when electrons are shared...Ch. 2 - Which of the following covalently bonded molecules...Ch. 2 - Prob. 13MCCh. 2 - Factors that accelerate the rate of chemical...Ch. 2 - Prob. 15MCCh. 2 - Waters importance to living systems reflects (a)...Ch. 2 - Acids (a) release hydroxyl ions when dissolved in...Ch. 2 - Prob. 18MCCh. 2 - Prob. 19MCCh. 2 - A chemical has an amine group and an organic acid...Ch. 2 - Prob. 21MCCh. 2 - Enzymes are organic catalysts that (a) alter the...Ch. 2 - Define or describe energy, and explain the...Ch. 2 - Some energy is lost in energy energy conversion....Ch. 2 - Provide the atomic symbol for each of the...Ch. 2 - Consider the following information about three...Ch. 2 - How many moles of aspirin, C9H8O4, are in a bottle...Ch. 2 - Given the following types of atoms, decide which...Ch. 2 - What are hydrogen bonds and how are they important...Ch. 2 - Prob. 8SAQCh. 2 - Differentiate clearly between primary, secondary,...Ch. 2 - Prob. 10SAQCh. 2 - Describe the mechanism of enzyme action.Ch. 2 - Explain why, if you pour water into a glass very...
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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.arrow_forwardenzymes are efficient catalysts because they can do which of the following? A) catalyze reactions that ottherwise would not occur. B) decrease the free energy of activation of reactions, C) decrease the standard free energy change o reactions , D) prevent the conversion of product to substrate, E) shift the equilibrium of reactions toward more complete inversion of productarrow_forwardstatements regarding enzyme function is false?arrow_forward
- a) Describe a specific chemical reaction that occurs within the human body and state the name of the enzyme involved, the substrate(s) of the reaction, and the specific product(s) formed. b) Enzymes are not used up in chemical reactions. So, what exactly does an enzyme do? In your answer you should refer to activation energy. c) Explain what is meant by the induced fit action of an enzyme, referring to the role of the active site, and to the activation energy of an enzyme-catalysed reaction.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_forwardAn enzyme accelerates chemical reactions by all of the following, EXCEPT: a) Bringing reactants close together b) Shifting equilibrium to favor the products c) Adding temporary charges to substrates d) Orienting chemical bonds for best reactivity e) Straining chemical bonds that will be brokenarrow_forward
- Which statement best summarizes the structure of an enzyme before and after it catalyzes a reaction? a.) Its structure is the same. b.) It gains a water molecule in the reaction. c.) It loses a carbon atom in the reaction. d.) It loses a hydrogen atom in the reaction,arrow_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_forwardWhich of the following statements is true concerning thermodynamics of reactions within a cell? a) Spontaneous reactions always consume energy b) Unfavorable reactions can be coupled to nonspontaneous reactions c) Compartmentalization can be used to drive up the concentration of substrates to force a reaction to occur d) All important reactions are spontaneousarrow_forward
- Enzymes work by... OA) Altering the equilibrium position of a reaction B) Altering the DG value for a reaction C) Increasing the activation energy for a reaction D) Preventing degradation of the product E) Promoting the formation of the transition statearrow_forwardLabel the following statements true or false: (a) A reaction is said to be spontaneous when it can proceed in either the forward or reverse direction. (b) A spontaneous process always happens very quickly.arrow_forward7arrow_forward
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