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Bch211 - Exam 2

46 Questions  I  By Grj2010
BCH211 - Exam 2
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1.  True or false:  Enzymes, being proteins, are sensitive to temperature and will be denatured by high temperatures.
A.
B.
2.  The following structure is shown in 
A.
B.
C.
D.
3.  True or false:  Aspirin acts as an reversible inhibitor of the COX 2 enzyme
A.
B.
4.  Draw the structure of B-D-Lactose in the Hawarth projection
A.
B.
C.
D.
5.  Which of the following enzyme properties is explained by the lock-and-key model?
A.
B.
C.
D.
6.  Sugars which contain an aldehyde group that can be oxidized are called
A.
B.
C.
D.
7.  In the induced-fit model of substrate binding to enzymes
A.
B.
C.
D.
8.  Which of the following is true of a noncompetitive inhibitor?
A.
B.
C.
D.
9.  The following represents the results of an experiment on a metabolic enzyme.  What is the optimum pH of this enzyme?
A.
B.
C.
D.
10.  The sign of Gibb's Free Energy is positive ("+") when energy is released
A.
B.
11.  True or false:  Energy is generally consumed during anabolism
A.
B.
12.  What happens to the entropy when ATP is hydrolyzed to ADP?
A.
B.
C.
D.
13.  Which statement about enzymes is incorrect?
A.
B.
C.
D.
14.  If the reaction AB has G = +15 Joule/mol and the reaction BC has G = -25 Joule/mol, the overall energy change AC will be  
A.
B.
C.
D.
E.
15.  Competitive inhibitors have this effect:
A.
B.
C.
D.
E.
16.  A monosaccharide used to form nucleic acids is
A.
B.
C.
D.
17.  If an inhibitor changes the slope of the Lineweaver-Burk graph, but not the x-intercept, it is this type of inhibition:
A.
B.
C.
D.
E.
18.  The carbohydrate below may be classified as
A.
B.
C.
D.
19.  The structure below is shown in what anomeric form?
A.
B.
C.
D.
20.  Which form of monosaccharides is preferred by human cells?
A.
B.
C.
D.
21.  A short description of a diastereomer would be?
A.
B.
C.
D.
22.  Which of the following is a disaccharide?
A.
B.
C.
D.
23.  Under saturation conditions, an enzyme-catalyzed reaction had a velocity V.  Which of the following would increase the rate of the reaction?
A.
B.
C.
D.
24.  Structurally, glycogen is most similar to 
A.
B.
C.
D.
25. 
  1. Lineweaver Burke - If everything else has a higher slope, anything lower than it represents the activation space.  everything above it represents the inhibition space
Gibbs free energy  delta G(negative - ) = spontaneous delta G(positive +) = nonspontaneous
A.
B.
C.
D.
26.  Refer to Exhibit 6A.  "Hindrate" is an inhibitor of triose phosphate isomerase.  When it is added to cells at a concentration of 0.1 nM, the enzyme's Km for the substrate is unchanged, but the apparent Vmax is altered to 50nM/sec. 
A.
B.
C.
D.
27.  The theory that proposes a somewhat flexible enzyme conformation is the 
A.
B.
C.
D.
28.  Which of the following is a common function of many vitamins in the body?
A.
B.
C.
D.
29.  The region of an enzyme where the substrate molecule fits is called the
A.
B.
C.
D.
30.  A polysaccharide containing B(14) linkages is
A.
B.
C.
D.
31.  Which of the following inhibitors binds to the enzyme at a site other than the active site?
A.
B.
C.
D.
E.
32.  The following compounds are enantiomers of each other
A.
B.
C.
D.
33.  Which of the following terms can be used correctly to fill the blank in the following equation?  
A.
B.
C.
D.
34.  The synthesis of an enzyme in response to a cellular need is called
A.
B.
C.
D.
35.  The structure given below has what type of glycosidic linkage?
A.
B.
C.
D.
36.  If the y-intercept of a Lineweaver-Burk plot = 1.91 (sec/millimole) and the slope = 75.3L/sec, Km equals:
A.
B.
C.
D.
E.
37.  21000 molecules were acted on by a single molecule of an enzyme in 15 minutes.  What is the turnover number?
A.
B.
C.
D.
38.  The value of Vmax changes in 
A.
B.
C.
D.
39.  Which of the following terms is a general definition of an enzyme?
A.
B.
C.
D.
40.  A Lineweaver-Burk plot is useful in the analysis of enzymatic reactions because
A.
B.
C.
D.
41.  Which of the following is correctly called a complex carbohydrate?
A.
B.
C.
D.
42.  Reactions requiring energy often occur with the simultaneous hydrolysis of
A.
B.
C.
D.
43.  A metal ion required for enzyme activity is called
A.
B.
C.
D.
44.  The simplest carbohydrates are called
A.
B.
C.
D.
45.  The conditions required for maximum enzyme function are called:
A.
B.
C.
D.
46.  The cyclic form of glucose results from the formation of
A.
B.
C.
D.
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