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Material Type: Exam; Professor: Gaquere-Parker; Class: Survey of Chemistry II; Subject: Chemistry; University: University of West Georgia; Term: Spring 2014;
Typology: Exams
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General, Organic, and Biological Chemistry, 4e (Timberlake)
Chapter 20 Enzymes and Vitamins
20.1 Multiple-Choice Questions
A) uses less substrate.
B) produces different products.
C) occurs at a faster rate.
D) requires more energy.
E) requires a higher temperature.
Answer: C
Objective: 20.
Global Outcomes: GO
product?
A) The substrate changes its shape so it can bind at the active site.
B) The substrate binds in the active site to form the E-S complex.
C) The enzyme assists in the conversion of the substrate to product.
D) The product is released from the active site.
E) A new substrate molecule binds to the enzyme for a new cycle
Answer: A
Objective: 20.
Global Outcomes: GO
A) first
B) second
C) third
D) fourth
E) last
Answer: A
Objective: 20.
Global Outcomes: GO
A) is remote from the site of substrate attachment.
B) is converted to a product.
C) catalyzes the reaction.
D) increases the energy of reaction.
E) includes the entire enzyme.
Answer: C
Objective: 20.
Global Outcomes: GO
1
A) catalyze chemical reactions.
B) maintain a neutral pH.
C) act as a reactant in carbohydrate storage.
D) maintain homeostasis.
E) eliminate waste products from the blood.
Answer: A
Objective: 20.
Global Outcomes: GO
A) plasma.
B) cell mitochondria.
C) lymph.
D) urine.
E) lipoproteins.
Answer: B
Objective: 20.
Global Outcomes: GO
A) fluid-mosaic proteins.
B) induced proteins.
C) substrate proteins.
D) fibrous proteins.
E) globular proteins.
Answer: E
Objective: 20.
Global Outcomes: GO
A) substrate.
B) cofactor.
C) coenzyme.
D) isozyme.
E) allostere.
Answer: A
Objective: 20.
Global Outcomes: GO
2
activity is called
A) regional specificity.
B) collateral specificity.
C) group specificity.
D) noncompetitive specificity.
E) general specificity.
Answer: C
Objective: 20.
Global Outcomes: GO
A) a rigid, nonflexible shape that fits the substrate exactly.
B) an area of the enzyme that can adjust to fit the substrate shape.
C) a key-like shape that fits into a pocket of the substrate surface.
D) a hydrophilic area on the enzyme surface.
E) a lock that bars a noncompetitive inhibitor from reacting.
Answer: A
Objective: 20.
Global Outcomes: GO
A) stays the same shape during substrate binding.
B) adjusts shape to adapt to the shape of the substrate.
C) stays the same shape while causing a change in the shape of the substrate.
D) uses an inhibitor to adjust its shape for the substrate.
E) uses a cofactor to change the shape of a substrate.
Answer: B
Objective: 20.
Global Outcomes: GO
that
A) lowers the energy of the products.
B) lowers the energy of the substrate.
C) changes the concentration of the substrate.
D) decreases the activation energy for the reaction.
E) changes the possible product formed.
Answer: D
Objective: 20.
Global Outcomes: GO
4
form and release the product (P)?
A) one
B) two
C) three
D) four
E) five
Answer: C
Objective: 20.
Global Outcomes: GO
A) heart attack.
B) kidney damage.
C) anemia.
D) uremia.
E) bulimia.
Answer: A
Objective: 20.
Global Outcomes: GO
A) hepatitis.
B) rickets.
C) heart attack.
D) prostatitis.
E) cancer.
Answer: C
Objective: 20.
Global Outcomes: GO
galactose and glucose belong?
A) oxidoreductase
B) transferase
C) hydrolase
D) lyase
E) isomerase
Answer: C
Objective: 20.
Global Outcomes: GO
5
at which temperature in the choices below?
Answer: A
Objective: 20.
Global Outcomes: GO
A) pH 3 and 37 °C.
B) pH 7 and 37 °C.
C) pH 7 and 37 °F.
D) pH 8 and 273 °C.
E) pH 7 and 273 K.
Answer: B
Objective: 20.
Global Outcomes: GO
Answer: C
Objective: 20.
Global Outcomes: GO
Answer: E
Objective: 20.
Global Outcomes: GO
7
A) inhibition of the surface enzymes by nitrogen.
B) interaction of the surface enzymes with oxygen.
C) a change in pH at the surface.
D) an increase in substrate concentration at the cut surface.
E) the presence of vitamin C in the apple.
Answer: B
Objective: 20.
Global Outcomes: GO
concentration of the enzyme will
A) increase the number of substrate molecules available.
B) inhibit the formation of products.
C) increase the decomposition rate of the enzyme-substrate complex.
D) decrease the turnover rate for the substrate.
E) increase the amount of reaction occurring.
Answer: E
Objective: 20.
Global Outcomes: GO
amount of enzyme is held constant, but the amount of substrate is increased, the rate of an
enzyme catalyzed reaction will
A) increase in an exponential fashion.
B) decrease at first, then increase in a linear fashion.
C) increase at first in a linear fashion, then remain at a constant high rate.
D) stay the same.
E) be inhibited by the higher concentrations of substrate.
Answer: C
Objective: 20.
Global Outcomes: GO
8
A) poisoning bacteria with toxins.
B) raising the temperature of a bacterium.
C) bonding to metal ions in bacterial electron transport systems.
D) inhibiting the enzymes for cell wall formation in bacteria.
E) acting as an acetylcholinesterase inhibitor.
Answer: D
Objective: 20.
Global Outcomes: GO
cannot enter the active site, is called a(n)
A) irreversible inhibitor.
B) proenzyme.
C) cofactor.
D) noncompetitive inhibitor.
E) competitive inhibitor.
Answer: D
Objective: 20.
Global Outcomes: GO
A) alcohol dehydrogenase.
B) acetylcholinesterase.
C) creatine kinase.
D) lipase.
E) penicillinase.
Answer: B
Objective: 20.
Global Outcomes: GO
enzyme
A) sucrase.
B) penicillin kinase.
C) penicillinase.
D) bacteriase.
E) phosphate lyase.
Answer: C
Objective: 20.
Global Outcomes: GO
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A) It occupies the active site.
B) It cannot be converted to products.
C) It has a structure similar to the substrate.
D) Increasing the substrate concentration can reverse competitive inhibition.
E) It binds to the enzyme at a site remote from the active site.
Answer: E
Objective: 20.
Global Outcomes: GO
A) binds at the active site of the enzyme.
B) alters the three-dimensional structure of the enzyme.
C) increases the rate of the enzyme-catalyzed reaction.
D) has a structure similar to the substrate.
E) has its effect reversed by adding more substrate.
Answer: B
Objective: 20.
Global Outcomes: GO
A) coenzyme.
B) cofactor.
C) isoenzyme.
D) allosteric enzyme.
E) zymogen.
Answer: E
Objective: 20.
Global Outcomes: GO
step in the reaction sequence, the process is referred to as
A) feedback control.
B) competitive inhibition.
C) irreversible inhibition.
D) negative catalysis.
E) concentration control.
Answer: A
Objective: 20.
Global Outcomes: GO
11
A) urease.
B) alcohol dehydrogenase.
C) creatine kinase.
D) the cytochrome oxidase system.
E) pepsin.
Answer: D
Objective: 20.
Global Outcomes: GO
A) water-soluble vitamins.
B) essential amino acids.
C) essential minerals.
D) oil soluble vitamins.
E) vitamins that are stored in the liver.
Answer: A
Objective: 20.
Global Outcomes: GO
A) only small amounts of enzymes are present in each cell.
B) only small amounts of substrates are available at any one time.
C) they can be eliminated in the urine.
D) each vitamin molecule can be reused many times as a cofactor.
E) they can be stored in the liver for future use.
Answer: D
Objective: 20.
Global Outcomes: GO
13
20.2 Bimodal Questions
A) lipid
B) enzyme
C) cofactor
D) coenzyme
E) substrate
Answer: B
Objective: 20.
Global Outcomes: GO
A) -ate
B) -ite
C) -ose
D) -ine
E) -ase
Answer: E
Objective: 20.
Global Outcomes: GO
A) oxidoreductase
B) transferase
C) hydrolase
D) lyase
E) isomerase
Answer: E
Objective: 20.
Global Outcomes: GO
A) lactate dehydrogenase
B) liver decompensation hexase
C) lactate dehydrase
D) liver dihydrogen kinase
E) lipase dehydrogenase
Answer: A
Objective: 20.
Global Outcomes: GO
14
A) scurvy
B) rickets
C) beriberi
D) pellagra
E) pernicious anemia
Answer: B
Objective: 20.
Global Outcomes: GO
A) rickets
B) scurvy
C) cancer
D) carpal tunnel syndrome
E) anorexia nervosa
Answer: B
Objective: 20.
Global Outcomes: GO
20.3 Short Answer Questions
Indicate whether each of the following is fat soluble or water soluble.
Answer: water soluble
Objective: 20.
Global Outcomes: GO
Answer: fat soluble
Objective: 20.
Global Outcomes: GO
Answer: water soluble
Objective: 20.
Global Outcomes: GO
Answer: water soluble
Objective: 20.
Global Outcomes: GO
16
Answer: fat soluble
Objective: 20.
Global Outcomes: GO
Answer: fat soluble
Objective: 20.
Global Outcomes: GO
Answer: water soluble
Objective: 20.
Global Outcomes: GO
Answer: water soluble
Objective: 20.
Global Outcomes: GO
Answer: fat soluble
Objective: 20.
Global Outcomes: GO
Answer: water soluble
Objective: 20.
Global Outcomes: GO
20.4 True/False Questions
Answer: FALSE
Objective: 20.
Global Outcomes: GO
Answer: TRUE
Objective: 20.
Global Outcomes: GO
Answer: TRUE
Objective: 20.
Global Outcomes: GO
17
20.5 Matching Questions
Identify each of the designated regions on the energy diagram for the conversion of a substrate
to product with and without an enzyme.
Answer: A
Objective: 20.
Global Outcomes: GO
Answer: D
Objective: 20.
Global Outcomes: GO
Answer: B
Objective: 20.
Global Outcomes: GO
Answer: C
Objective: 20.
Global Outcomes: GO
19
Match the correct term in enzyme action with each description.
A) cofactor
B) lock-and-key theory
C) enzyme-substrate complex
D) active site
E) coenzyme
Objective: 20.1, 20.
Global Outcomes: GO
Objective: 20.1, 20.
Global Outcomes: GO
Objective: 20.1, 20.
Global Outcomes: GO
required by some enzymes for activity
Objective: 20.1, 20.
Global Outcomes: GO
Objective: 20.1, 20.
Global Outcomes: GO
Answers: 5) C 6) E 7) D 8) A 9) B
20